Questions tagged [power-supply]

A power supply is an electronic device that supplies electric power to another device, such as a computer, monitor or printer. This is achieved by converting wall power (or mains power) to a lower voltage, and in most cases also from AC to DC. Most power supplies also provide protection from overload, power surges and other potentially problematic or hazardous conditions.

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Protect computer from static electricity

I have an issue with static electricity, that isn't so annoying as it is worrying. When I'm cozy at home, I like to wrap myself in a blanket. Because of that, I build up a lot of static electricity. ...
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Repair hard drive short circuited by miss pinned PSU?

The RAID volume in my Synology NAS crashed and their advice was to plug the drives into another computer to attempt recovery. The volume crashed, but both drives were healthy and some of the data was ...
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How did HP made their power on bottom work with no VSB (standby) on their pro 290 and to make a 24pin ATX psu work with it?

The factory psu is a psu with RuRach board and has two ATX 4pin and 3 of 7 inline mini: From HP site, the full 7pin inline mini of the p2: Apparently, green is for PS_ON; grey, for PWR_OK; black, ...
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How to disable the power button on Windows 10?

I have the following settings set in my Power Options settings: However, it still does not stop my computer from being turned off when the power button is pressed. My cat often jumps onto my computer ...
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Lenovo laptop won't turn on

I'm having a weird issue with a lenovo V130 laptop that wont turn on. The behavior is as follows. I plug the AC adapter, and the led next to the plug turns on. When I push the power button the power ...
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High-pitched noises comming from modern notebook

This is a computer hardware, and probably also a physics question. When I bought my new notebook, I immediately perceived pulsed, high-pitched noises from the interior PC right after startup. ...
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RGB light acting weird

I added 2 fans through molex connections (0.18 Amps each) and now the side panel case RGB does not automatically go on anymore when I start up my PC, even after disconnecting the new fans. The RGB is ...
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After attempted PSU replacement PC keeps booting into BIOS

I've bought Asus 2080Ti graphics card and turned out my old PSU can't support it, only one PCIE cable while the card needs 2. So I've bought Corsair RM750 PSU, installed everything and booted my PC. ...
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Different results for power measurement on ubuntu using powertop and energy_uj

I want to measure power usage of the whole PC in software on Linux. I've tried these two methods from here and here: using powertop: rm -f powertop.csv sudo powertop -q -t 60 -C powertop.csv cat ...
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Troubleshooting CPU, PSU, MOBO, HW [duplicate]

Have a well aged PC that has started acting up. In short terms: It has worked fine for about 13 years. BIOS, Windows 10 Started out with trouble booting. When pressing the ON button it sometimes ...
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PC won't post after every power outage

I moved into a college dorm a few days ago and whenever I leave the room I have to take my student ID with me, without the ID in its place the room loses power. I had to learn the hard way that this ...
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Using a 6 amp connector instead of the 16 amps provided in Power Supply box ( Corsair RM850)

I purchased a corsair RM850 which comes in the box with a 16 amp power cable to plug into the home socket. Problem is that I do not have a 16Amp socket in any of my walls. There are 2 questions which ...
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Can I add power to a USB hub through a molex connector?

I have a 5 1/4 drive bay unit that has 6 USB ports, card readers, etc, and a Molex connector passthrough. Because there are so many USB ports, they provide very little power. Can I disconnect the ...
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Pre-Boot BIOS Setup Power Setting/Warning

Currently when I startup my Dell Latitude 5400 I receive this message: Alert! You have attached an undersized 60W power adapter to your system, which is less than the recommended 90W power adapter. ...
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PC turns on for a split second then turns off

My PC recently stopped working. I turned it on one day and heard a pop then it turned off and when I tried to turn it on it wouldn’t. I assumed it was the PSU so I changed it but then after trying to ...
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What is 4-pin onboard HDD power connector on Supermicro?

I'm running server using Supermicro X10SDV-4F-TLN2F motherboard. But I found unusual 4-pin male molex power connector soldered into mobo and User's manual says this connector is HDD PWR, and exsisting ...
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Can you run a laptop with a dead battery using only a power bank of appropriate size?

I have a MacBook Air (13", early 2014) with a dead battery (won't accept charge). I currently run it using the MagSafe power adapter. However, the magnetic connector is too easily disconnected ...
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FSP Zen power supply flaw or what?

I have an old FSP ZEN 300W power supply (reviewed here). I have a new desktop config that I wanted to utilize this beast for but unfortunatelly failed. The config consist of a Gigabyte Aorus Pro 550i ...
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The purpose of PSU & motherboard -12V line

Typically PSUs have -12V line rated about 0.2 - 0.5A. But for what is it used? Is it used for example with one of the +12V lines to get total 24V? What component or so needs that -12V or possibly 24V?
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Disable "Slow Charger" warning in Windows

I have several laptops which support USB-C charging, and a 65W GaN PD charger. It's nice to have a compact power supply that works on a bunch of different laptops, even if it can't deliver the full ...
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Slow Wattage of Thinkpad T480 Charger

Here are the problems I have with my T480: The "Slow Charger" warning appears in Windows. I tested several chargers on Windows and Linux that support at least 65W, but Lenovo Vantage and ...
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PC stops after a couple of seconds

Today, my trusty DELL XPS 8300 desktop PC did not start. First time after years of flawless operation and daily use. It powered up and then powered down after a couple of seconds without reaching the ...
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My Dell Inspiron 15R 5521 laptop turns off suddenly at random times

I have a Dell Inspiron 15R 5521 laptop that is 7 years old now, its running Windows 10. It just starts to turn off suddenly at random times without any warnings, when I power on again, starts running ...
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Computer only turns on after unplugging all drives

Specs: MOBO: MSI x570 gaming edge wifi CPU: AMD Ryzen 5 3700x RAM: 2x 8gb hyperx sticks (don't remember the ratings) GPU: EVGA GeForce rtx 2060 super PSU: COOLER MASTER 650w gold OS drive: Samsung 860 ...
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How to raise VTT_CPU voltage when the BIOS says it is 0.7V? - Boot occasionally stuck in "memory init." process

My BIOS has a monitoring tab that has a bunch of great voltage measurements for my Asus Z9 series motherboard. But, next to the label "VTT_CPU", it says +0.703V in red lettering. I assume ...
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New monitor recurring blackout: How to isolate my monitor supply from my refrigerator?

Context My new Philips monitor's power supply is very sensitive of transients of electricity network in our home, means if refrigerator starts or stops, the supply is (I suppose) trying to guard ...
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PSU buzzing corsair rm 750 [duplicate]

I recently build a pc and i hear my psu buzzing loudly sometimes. I send my PSU back to the store i bought it from and they said they didn' t seem to have that problem over there with the psu after ...
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How to Hook Up 3 PSUs with mobo ATX Splitters

I want to hook up 3 PSU's to a computer for 3D rendering and I know you need those splitters so they can tell the PSU it's plugged in. If it's not obvious, the extra PSU's are for more GPUs. I know ...
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Laptop shuts down shortly after boot up

I have an Acer Aspire laptop running Windows 10, and after boot up, it just turns off (as if the power was cut). This happens regardless of power supply (plugged in, battery in or out, power ...
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Random black screen no cursor no freeze one monitor

I've checked some questions related to my issue but either they are too old or got no answers so i'm going to try asking personally. My specs: GPU: Nvidia Geforce GTX 1070 OC CPU: i5-9600k Storage: 2 ...
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SRock H310CM-HDV/M.2 and Intel i7-9700KF doesn’t post and just shows a blank screen

I recently bought an ASRock H310CM-HDV/M.2 motherboard and I am trying to pair it with a Intel i7-9700KF but whenever I try to boot I just get power through the fans and GPU but no boot. There is no ...
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Laptop charger: Coil whine under low load but not under no load

I have a Lenovo laptop charger dating from 2013. It produces coil whine (not very loud, cannot be heard from a sitting position) when the laptop is powered off or in stand by but not when it is ...
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Graphic card and GPU power Source

I have recently bought a new graphic card, and after inserting it into the PC I discover it need an auxiliary power source: The thing is, I no not have a cable 'ready' for this. I have another socket ...
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My computer starts and stop instantly when one specific hard drive is connected

Last night I turned my computer off and went to bed. In the morning I tried to turn it on it turned on but stopped running instantly so I removed the side panel and checked what happened. I unplugged ...
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What to expect after a power surge? [closed]

I have just experienced a power surge in my house and now my computer won’t turn on. I have pretty modern hardware including a Asus B550 pro 5 motherboard that has surge protection. I know something ...
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800W non-modular PSU splitting

I am case-swapping an HP Omen 30L desktop that came with an 800w psu. According to the PSU label, the 12v rail can support up-to 60A. PSU is non-modular and it has 2x8 pin PCIe connectors. Would it be ...
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Can not turn off computer

When i turn off computer stays off for few moments (no sounds and lights) and reboots. I encountered power grid variation, maybe this caused problem. Tried various bios options and cmos reset but for ...
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PC freezes on OS and OS installation. More than like a hardware issues but I am unsure

Good day everyone,so I was using my PC as usual last night, playing some world of warcraft when windows 11 suddenly blue screen. I booted my PC and it came back normally but it kept crashing. I have ...
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How to find replacement fan for PSU?

I would like to replace my PSU fan because it makes a well hearable noise (it is the fan, confirmed). First I hoped a simple lubrication will do it, but unfortunately the fan center is completely ...
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Why is the power output of a power only cable on a USB Y-Cable so poor? [closed]

From the power only cable I get 310mA at best If I use the Data+Power end I get 1000+mA I have an android head unit in my car and the power output it pathetic, I get roughly 200mA from that and as I ...
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How do I find the (IPMI) IP of a machine that won't turn on?

Bit of a weird question - but I bought a storage server on an auction a while back. There's no documentation or stickers on the machine, and it will not turn on by pressing the power button. I'm ...
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APC Back-UPS and Corsair PSU do not work well together

UPS: APC BX700U-GR PSU: Corsair RM550X Maximum power consumption of all devices connected to the UPS: 100-110W Average power consumption of all devices connected to the UPS: 60-70W It is not possible ...
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Rog Zenith ii Extreme won't turn on

I'm building a deep learning system for my company and my current build is: Rog Zenith ii Extreme 2 * Aorus RTX 3090 256 GB Kingston Fury 2666MHz EVGA Supernova 1600W AMD 3960 threadripper Along ...
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How can I detect the USB-C power delivery voltage?

I have an HP laptop which I charge with a USB-C charger through the USB-C port. I have no idea which power delivery (PD) version it has and if it's PD-compliant at all. However, as the charging works, ...
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Computer turns off randomly

Desktop, custom built PC, Intel i7 UEFI, 1 NVM 1 HDD 4 SSD. Computer turns itself off randomly, a few seconds later turns back on. Replaced power cable, checked internal cabling, disconnected HDD, 2 ...
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Does the USB port adjust the power output according to the consumer?

In question: What is the power output of a USB port? per Doktoro Reichard's answer: As stated in Wikipedia The USB 1.x and 2.0 specifications provide a 5 V supply on a single wire to power connected ...
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What is this connector so I can search for the right item?

This connector goes from an ASIC PSU to the control board and it controls voltage. Its a 3 pin connector and it appears to have 2 grooves on the back. I ordered a 3 pin jumper and while the pin ...
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Fans on motherbaord and chassis not spinning after replacing power supply

Fans in the motherboard doesn't spin after replacing the psu. The old one doesn't work so I replace it with a new ones (forgot model name) of 240v. the small led in the motherboard shines but the cpu ...
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Computer over current detected

Hello so I’ve had my pc for 5 years no problem. The build is as follows: mobo is ASUS H81M-PLUS, CPU is intel 4790k, GPU is Zotac 960 4gb AMP!, ram is 16gb(8x2)of Corsair xms3 DDR3 and PSU is EVGA 650 ...
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PC building: Do you have to plug in the 4-pin CPU connector?

My motherboard has a single 4-pin power connector next to the CPU. My power supply has a 8-pin CPU power connector but not a 4 pin one. Instead of going out and buying a 8-to-4 pin CPU power adapter ...
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