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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Blank screen then doesn’t power on toshiba c660-pr2 [closed]

After cleaning dirt from my keyboard, I pressed the power button. The screen wasn’t working, but after ten minutes windows 10 symbol appeared. I waited for one hour and the symbol was still there. I ...
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Is it true that PC power supply screws are 'connected' to earthing/grounding pin of the power supply?

I was watching a YouTube video (I've provided link in the comments) where the user claims that sometimes when we don't have earthing done in our homes or you are using two pin plug in the socket, the ...
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What would cause a fully powered off workstation to turn itself back on?

I have an old workstation that I want to keep fully powered off when I'm not around. Just recently I came home to find it powered on, even though I didn't touch it. There is no one else around (and ...
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Why does unplugging and plugging back in my laptop power cable result in a short, sharp, immediate speed boost to all processes?

So I've got a cheap, barebones Lenovo Windows 10 laptop and I've noticed a fascinating behaviour whenever I toggle (unplug and then immediately plug back in) the power cable: I get an immediate burst ...
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Low consumption PC Build [closed]

I would like to build a low consumption PC that will be on 24/7. It will not be used for intensive calculations of course. I've already tried some prefabricated solutions like this one but I found it ...
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Powering USB Cable From Different Head

I Have a Mikrotik RB951UI-2HND router, and a Huawei E5577 Modem Wi-Fi with modded firmware so it can run without battery (directly from power source). So I want to connect the two together with USB ...
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Computer died after pressing reset button, DRAM Led stuck on

yesterday after a long gaming session I decided to quit the game and my PC stuck at the exit screen, I couldn't move my mouse pointer, ctrl+alt+del didn't didn't work and out of frustration I decided ...
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What is the reason that the usb Y-cables do not separate power from data?

A similar question was brought up here but the question there was whether it's safe to plug a Y-cable to yet another power source, which was answered that there would have to be either a very stable ...
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picoPSU-120 can not power 4 HDDs?

I replaced my old PSU of my HP Proliant Microserver with the Mini-Box picoPSU-120. I have 4 x 4TB Western Digital Red connected to it. Two are connected via this extension cable and two are using this ...
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System not starting. Automatically power cut after sometime

My System is automatically cutting the power.When i start my system it opens and then OS starts and unexpectedly power cut happens then it automatically restarts but this time it only shows a blank ...
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PC sometimes not booting at all, or boots but shutsdown at random

Recently I added a wifi-adapter to my PC as well as bluetooth. All went well installing that, however afterwards I'm now noticing some weird issues which probably aren't related to that installment. ...
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Random crashes to black screen after replacing GPU

After replacing the GPU to a newer model, I started experiencing seemingly random PC crashes to black screen. I've never experienced an issue like this before and I have no idea what part might be at ...
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Starting problems PC

So my computer started to not boot and when I checked my inside case and ran it my cpu fan will turn on and off and then on and off and the cycle continues. When I unplug my gpu from the psu my cpu ...
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How to connect 4 HDDs to a PICO SPU which has only one 4 PIN Molex?

I want to exchange the PSU of my my HP ProLiant N40L Microserver with a PICO PSU which has 1x 24-Pin-ATX12V-2.x, 1x 4+4-Pin-12V, 1x 4-Pin-5,25", 1x 15-Pin-SATA connectors. However, I have 4 HDDs ...
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would disabling a GPU in windows reduce a laptop's power consumption?

So let's say I have a laptop (ThinkPad P15 Gen 2) with a 230W power adapter, a 140W NVIDIA RTX A5000 Max-Q 16GB GDDR6 and an 11th Generation Intel Core i9-11950H Processor with vPro. Let's also say I'...
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Do I need to buy a different PSU?

I recently bought a 750W power supply with intent of using it for my 3070 gpu. When I installed it I noticed that the only cables left remaining where the ones in the photo below. Clearly I messed up. ...
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Linux embedded system: detect power on USB (as USB device)

I'm working on a Linux embedded system that can draw its power from two distinct sources: a dedicated power supply power supply through USB (connected to an external USB host) I must know when the ...
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Laptop touchpad problems when PSU charger (Original) is plugged in

I have an HP laptop which battery is damaged since February of 2021. HP DIAGNOSTIC TOOLS tells me that battery internal capacity is only at 10% of its factory capacity. The battery is also inflated. I ...
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New PSU not providing power to Hard Drives

I recently bought a new graphics card for my computer and a more powerful PSU to match the requirements. After installing the parts, when I tried starting the computer it didn't boot Windows and ...
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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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1 vote
1 answer
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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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1 vote
2 answers
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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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1 vote
2 answers
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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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2 votes
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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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