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 ...

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4
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2answers
4k views

Do I need to turn off my UPS when I power off my PC?

Do I need to turn off my UPS when I power off my PC? Or, put differently, is it okay for the UPS to be turned on all the time?
0
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1answer
21 views

How to configure Windows 7 in live mode (readonly C:) like Linux

I usually create headless box with a raw Debian and AUFS file system to set the CF card in read-only mode. All is load in RAM and not change append on CF card. So i can safely shutdown the box by ...
1
vote
1answer
614 views

Lenovo Ideapad z510 crashes when connected to AC power but works fine with the battery

I use a Lenovo Ideapad z510 running Windows 8 x64 and earlier today, during a snowstorm, power went out. Later, power came back and I got on my computer. As I was using it, I — idiotically — lightly ...
0
votes
3answers
40 views

Why isn't my computer turning on past boot screen?

I have an old server computer from 2005 that still has a lot of potential in my opinion. I acquired it from my dad’s old storage unit. It was running well for about a month and then one day—in the ...
0
votes
1answer
3k views

CPU fan turns on for a second and stops, PC does not start at all

I have checked my PSU and it works fine. When I turn on the MOBO, the CPU fan, case fans and the psu fan itself turn on for half a second and then turn off. The PC remains off. The Bios light turns ...
2
votes
0answers
21 views

Third-party AC adapter for Acer Veriton L460 desktop causes fans to continuously run at full speed, even when system is powered off

I'm not sure this is the the right place to be asking but it seemed like the best option. I acquired an Acer Veriton L460 (Ultra SFF Desktop) which requires an AC converter of 19V 17.1A so I ...
0
votes
0answers
15 views

Can I use a 130V AC adapter for my european laptop? [duplicate]

I have an old Dell XPS Studio 16 whose AC adapter broke a while ago. I've been using a universal adapter, but apparently Dell has some hardware checks hard coded that won't let the adapter charge the ...
4
votes
2answers
1k views

Why is the battery dead inspite of the full charge the previous day?

My laptop is 9 months old. In which I sparsely use the battery of the laptop as I am connected to the power outlet most of the time. This problem has started since 4 days. As per this post my system ...
0
votes
2answers
258 views

Battery 100% still charging

I have a Acer AspireV3-772G running Windowws 8.1. My battery indicator shows 100% available ( plugged in,charging) status. I calibrated the battery but no difference. Also I have bought a new battery, ...
2
votes
1answer
20 views

Computer randomly restarting in the middle of some CPU and GPU activity (viewing videos, gaming)

Asking on behalf of someone I know. His current build - Processor: Core i7-4770k RAM: GSkill Sniper Series DDR3-1600 8 GB total RAM 4 x 2 GPU: EVGA GTX 780 SC SSD: Samsung 120GB 840 Pro PSU: Corsair ...
5
votes
5answers
21k views

My computer doesn't start - it is stuck in a turn-on, turn-off loop

When pressing the power button, my computer starts making start-up noises, but after a few seconds it shuts down. Then, after 2-3 seconds, it automatically starts turning on again and a few seconds ...
1
vote
1answer
46 views

How to discharge static electricity

I'm building a new PC. I never cared about grounding myself because I've never had problems, but this time I don't want to take any risks. This is a new PC that doesn't have a power supply installed ...
0
votes
2answers
26 views

Does a PCIe 8pin power cable use just one 12V rail.

Looking at a diagram below of a PCIe power supply connector it shows it has 3 12V pins. When it's plugged into the PSU how many 12V rails does it use? I assume it is just one, but how does that work? ...
1
vote
1answer
20 views

PC Rebooting randomly. PSU failure or not?

Sometimes when I play heavy games my computer reboots/turns off without prompting, blue screens, ... It just shuts down after 5 minutes of gaming, but it happens only with specific games (ONLY Star ...
-1
votes
0answers
25 views

Will an 500VA UPS work with a 450W PSU? [on hold]

I have a COOLERMASTER GX 450W RS450-ACAAD3-EU PSU and a 4 years old APC BE550, 550VA UPS currently. I can buy an APC Back-UPS BK500EI / CS, 500VA very cheap currently. Would it work with my PSU? (The ...
0
votes
2answers
34 views

How to get enough watts for Power Supply

I have a Pre-built computer it's the Phantom 410 case with AMD-FX 6300 prossesor, but the power supply is only 150 watt. I want to add a fan, but I can't buy a new power supply, so how do I use power ...
0
votes
0answers
17 views

NIC on PCI bus only works when attached to POE supplying network

This is a strange one.... I have a PC with both an on-board NIC and an additional NIC in a PCI slot. The NIC in the PCI slot will only create a link when attached to a network which supplies POE. ...
1
vote
0answers
26 views

I keep getting the usb inserted sound whenever I plug or unplug something to a power socket. Should I worry?

I own a Lenovo G510. I use a cooler base external mouse keyboard monitor 2:1 speakers Whenever I plug something to a wall socket that is near to the one that I use to power everything (when ...
0
votes
0answers
25 views

Computer won't turn on after Shutdown without turning off the power supply for a minute

In the past month, for some unknown reason everything in my PC started to fail one by one. From CPU to hard disk. In the end of replacements and buying new ones, I have this: MSI 970A-G46 (new) AMD ...
1
vote
0answers
17 views

PC won't boot with more than one monitor plugged in, but once booted, works perfectly with multiple monitors

So my graphics card is an asus nvidia geforce gtx 750ti, and works perfectly with multiple screens. The problem is that the computer will not boot with more than one monitor plugged in, but after it ...
1
vote
1answer
21 views

Necessity for new cooling unit when moving from a Core 2 Duo to a Core 2 Quad

I own a desktop with the MSI P965 NEO-F motherboard installed. As you can see from the link, this motherboard can only accept Intel Core 2 Duo - generation processors, with the LGA775 socket. It is a ...
0
votes
2answers
6k views

Can a faulty battery cause my laptop to shutdown even on AC line? (battery installed AND plugged in together)

Until recently, I experience something rather annoying (and troublesome) with my laptop. It spontaneously shuts down itself without any warning, it restarts. No blue screen, no hanging program, just ...
0
votes
0answers
33 views

How do I get my 3rd chassis fan running?

This is the first time I ever opened a pc, so I'll try to explain carefully what I did. My PSU died and I bought a new one, and reconnected the cables myself. (New PSU: Cooler Master GM G650M) ...
1
vote
2answers
512 views

How do I turn off MagSafe light?

When I go to sleep at night, the two green lights (emitting from both sides of the MagSafe connector of my 13" MacBook Air's power adaptor) light up my whole room. How do I turn these off? I ...
0
votes
3answers
2k views

My GPU stops suddenly and get black screen

I have a Nvidia GeForce GTX 660 graphics card and a dual monitor setup. Sometimes my screens go black and get a warning like: Nvidia Kernel stops responding. I tried a lot of things; ...
0
votes
1answer
3k views

EVGA Geforce GTX 760 ACX Installation issues

I recently purchased a new Geforce gtx 760 from EVGA with ACX cooling, and I'm quite confused with the power supply. The card came with 2 PCI connectors, however one was a 6-pin and the other was an ...
0
votes
7answers
3k views

Preventing the power supply (PSU) from blowing the motherboard or vice versa

Problems with power supply and motherboard compatibility appear to be common. My power supply/motherboard nightmare Power Supply Too Big? Can a +5VSB supply rail value of 5.4V prevent a PC from ...
3
votes
6answers
16k views

Can I use different power supply on my laptop?

Battery on my laptop is 4%, I don't have original power supply at the moment and I have some work to do. Is it safe to ask a friend to give me his power supply from another type of laptop? What ...
0
votes
1answer
3k views

Can I charge my laptop using a power bank using my laptop charger?

I have a Dell XPS-1530 laptop with a 9 cell battery. It's working fine but I was just wondering whether I could use a power connector or something to plug my laptop charger's 3 pin plug into another ...
1
vote
2answers
36 views

Why do PSUs have multiple lines (cables) with the same voltage? (even if they are wired in parallel)

For this question i need a technical\engineering answer. Why are there multiple cables carrying the same voltage? Since they are wired in parallel both in the psu and in the motherboard (i checked ...
7
votes
3answers
8k views

Does a laptop computer charge faster when off?

A laptop power supply can supply a limited amount of power. Conceivably, then, when the computer is running, some of the power must be diverted to the processor and other components, leaving less to ...
5
votes
1answer
532 views

When is too much voltage too much on a PC?

TLDR: The BIOS shows voltages as vcore: 1.248, 12V: 12.566, 5V: 5.160, 3.3V: 3.424. Is this bad? I got one miniITX motherboard that supports a 19 V laptop input instead of the regular ATX ...
19
votes
6answers
12k views

Why does my PC successfully boot only when unplugged for more than a few minutes?

I have an HP Pavilion Elite desktop computer, model HPE-490t. I like it because it didn’t cost too much, boots itself from an SSD, came with 16 GB of RAM, and has 6 CPU cores for editing video and ...
0
votes
1answer
48 views

No beeps and no display when I power on PC

The fans are working. There is no beep even in removing the RAM. I tried everything that I found on the internet, but nothing worked for me. Can anyone help me? I have an Onboard video card. ...
0
votes
1answer
33 views

Bricked my computer instead of the kindle fire?

I was rooting a kindle fire for a friend and now my pc doesn't work. Symptoms are: inputs no longer work (usb or serial or dvi; hdmi produces a flicker but displays a message "no valid input" so I ...
0
votes
0answers
14 views

Laptop power supply wattage differences on identical specs?

I was comparing the Macbook Pro 15" 2015 (highest end) with the Lenovo W541 with similar specs (same CPU, very similar GPU, etc.) and the MBP is supplied with a 85W power adapter, while the Lenovo has ...
0
votes
1answer
17 views

Should I replace the AC charger as well when buying a new battery? [closed]

My notebook is already 4 years old, and it's battery basically died from one day to another (one day it could support the notebook for an hour, the next day I could get at most 2-3 minutes out of it). ...
0
votes
3answers
3k views

Should my HP Pavilion dv6000 operate w/o battery pack while using electrical plug-in? Mine won't

While using my computer, it shut down, and I cannot get it to turn back on. I have tried removing the battery to see if the computer would work without it, but it did not. The light is on where the ...
2
votes
2answers
3k views

Dell inspiron n5010 has failed to recognize AC adapter

Recently my dell inspiron n5010 has failed to recognize my 90W adapter (despite powering it just fine). Full error message: "The AC power adapter wattage and type cannot be determined. the ...
0
votes
1answer
19 views

Can I use a different laptop power supply, same tip polarity, voltage, at least same amperage

My understanding is that new Lithium-Ion batteries can be dangerous because of some of the circutry surrounding them. To put it simply you do something wrong and they will start on fire or even ...
10
votes
2answers
682 views

What happens when laptops reach 100% charge?

I have been reading alot of mixed views on how Lithium Ion batteries work when it comes to laptops. I have the new dell xps 15, with an intel i7 cpu, 16gb ram, and a 512gb ssd. Is it bad for the ...
3
votes
1answer
55 views

Lenovo X1 Carbon suddenly slows when AC is attached

Today I notice that my one year old laptop Lenovo X1 Carbon (Windows 8.1) is 2,5 times slower on everything, only when AC is attached. As soon as I detach the AC to go on battery, performance ...
1
vote
3answers
15k views

Dell Laptop Battery Not Charging?

I have a Dell Vostro 3555 and recently I noticed that my battery is not charging at all. I see this message when I boot up the computer: The AC power adapter type cannot be determined. You system ...
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votes
1answer
35 views

can i add a graphics card to this laptop?

I have an HP Envy 15 laptop with specs at http://www8.hp.com/h20195/v2/GetPDF.aspx/c04514967.pdf . I want to add a GPU to the free PCI Express x1. There are two issues, one that the GPU's generally ...
1
vote
0answers
31 views

Canned air spray got liquid all over my PSU [duplicate]

Wanted to remove dust from my PC with a canned air aerozol "duster". Tried it a couple of times without applying to my computer and all seemed fine. Decided to go for the PSU first: since it's a the ...
0
votes
1answer
19 views

Graphics card doesn't output

I had a fully working computer set up with a Corsair CX600M PSU, and a Radeon HD 5450 GPU, but I needed a more powerful GPU, so I bought a Gigabyte R9 280x, (This one: ...
17
votes
3answers
144k views

What is the power output of a USB port?

As the title says, what's the power output of a USB port? Is it a standard value, or it may change depending on manufacturer/model, and so on? If that value is not standard, how can one determine ...
0
votes
1answer
37 views

Do the molex connectors on a 2x molex to 6 pin PCI connector need to be on different leads?

My video card came with an adaptor like this Its 2 gaptoothed male molex connectors (with horribly non standard colour coding) connected to a 6 pin PCI-e power connector. I got it with a zotac ...
0
votes
0answers
12 views

Powerline Network cuts out when Laptop Power Supply is plugged in

I have a powerline adapter in my room because it's too far away from the router to get a good wifi signal. I have my main laptop plugged in and that works fine. However, I tried plugging in a second ...
0
votes
1answer
348 views

Replaced screen in Acer Aspire, now won't power on or acknowledge it's plugged in

I recently replaced the LCD screen from a different model Acer Aspire (Both 15.6" , same connector and LED backlight) in my laptop. I've replaced LCDs from other laptops before, so I'm fairly ...