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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What are the effects of power dips (brownouts) on computers?

A lot of UPSs advertise they protect against "brownouts". What exactly is the effect on a computer if the voltage goes low but not completely out? Where I'm currently living the lights frequently ...
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37 views

Whenever I run a CPU intensive process, my system restarts

I've noticed this when I try to calculate the inverse of a 10,000 x 10,000 random matrix with Matlab or Octave. My computer just restarts without prompting any error message. I have already looked for ...
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39 views

Laptop powers off within seconds of powering on; suspect battery issue; how to confirm?

I sometimes leave my laptop open and on overnight -- laziness, I suppose. A few days ago, when i woke up, I saw my laptop was shut down. Odd as I didn't recall turning it off. When I tried to restart ...
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1answer
35 views

Power monitor from USB

What are the possibilities of powering a computer monitor from USB, either with one or more ports? And what would happen if the monitor does not get enough power? For example, the T2236MSC-B2 monitor ...
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2answers
31 views

Computer attached to UPS temporarily died when another computer was plugged in

The scenario: I attached a desktop to a power strip that was connected to a UPS and then all the other components on the UPS shut off. I thought I might have accidentally clicked the kill switch on ...
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1answer
40 views

How can I buy country-specific power supply cords? [closed]

Almost every laptop power supply I've ever seen has had two parts, like so: It's been my understanding that this is so the country-specific part is limited to some copper and plastic instead of the ...
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1answer
37 views

2 devices with different amp requirements on same power supply

I've got a 5V 40A DC power supply. I want to connect one device which requires 5V 1A DC, and another device which requires 5V 30A DC. Is it safe to wire these to the same supply on the same screw? ...
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1answer
157 views

What's a good power supply (volts and Amps) to power a USB hub to use with external HDs

I'm using a 7 port usb hub found here: http://www.ebay.com/itm/AC-Power-Adapter-Cable-for-PC-Laptop-7-Port-USB-3-0-Hub-On-Off-Switches-/331707642029 The power supply it came with was very weak. It ...
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26 views

Desktop won't turn on

So I have been having problems for a while now (probably about 7 months) with my computer not turning on after it gets shut down, but the problem somewhat subsided and didn't give me any real issues ...
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1answer
451 views

Would 650w PSU be enough for GTX 970 & GTX 960 sli?

Title says it all. My specs(Currently): i7 Quad Core 4790 3.6GHz Asus Z97-E Mobo (Supports SLI) 16GB HyperX Fury RAM (2x 8GB) NVIDIA Geforce GTX 970 4GB 1TB Hard drive Corsair H55 Water Cooler ...
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109 views

PC - No Video out even with Brand New RAM and Mobo

Here are the specs: Mobo: G41M-P25 RAM: Stick 1 & 2: Patriot PSD34G1333KH 4GB PC3 DDR3 10600 CL9 2x2GB 1.5V Stick 3: Elite 4GB DDR3 1333 CL 9-9-9-24 1.5V (ALL sticks are unbuffered) CPU: Dual ...
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73 views

PC fails to turn on when I connect 8 pin atx

My PC fails to turn on when I connect the 8 pin ATX 12v. I can hear a whine from the PSU when it wont turn on, the fans do not spin at all. I can get it to start when I have the graphics card ...
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0answers
31 views

Regarding USB battery charging, what is a 'unconfigured device'?

The USB Battery Charging 1.2 Specification says that 'unconfigured devices' are allowed to draw up to 1.5A for CDPs and DCPs, whilst configured devices are able to draw up to 5A as long as the ...
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26 views

optical mouse only works near an electric field

two days ago,i faced a serious problem my optical mouse stop working suddenly. it just simulate a click and hold instead of single click and other strange things. i released that it works fine only if ...
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1answer
71 views

MEMORY_MANAGEMENT BSoD on Windows 8.1

I have a new machine running Windows 8.1 with the following brand new components: Intel Core i5-6500 8GB DDR4 2400MHz Kingston HyperX Fury (one 8GB module) ASRock Z170m-ITX/ac Samsung 850 EVO 250GB ...
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1answer
121 views

How long will a power supply last? [closed]

I have a 5 year old desktop that is still going strong. I replaced its video card, harddrive and cpu fan. I always figured that once I either get a decent amount of income, hardware requirements went ...
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2answers
50 views

Should CPU fan be run at lower power, or from PSU?

I recently bought an overclocking CPU fan for use with my Asus Sabertooth x99 MB. The CPU_FAN pins provide a max of 12W 1A according to the MB manual, but my fan is rated at 14.4W 1.2A, so would it be ...
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1answer
14 views

Power supply current rating

I've been researching my problem but really everything I found is complicated and I don't understand it. I bought a GPU with a requirement of a 400W power supply with 12V current rating of 22A. ...
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1answer
47 views

Weird sound from a used GPU i bought. Might be a PSU thing?

https://youtu.be/ZRnEYppzEC8 I have a 600W PSU, a N680GTX MSI Twin Frozr 3 and a Sabertooth P67 MB. In addition to this, I have 2 SSD's (one which is empty) and a 1TB HD. Before I bought this used ...
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99 views

Uninterruptible Power Supply Unit Failure, Or Is It the Battery?

I have an APC brand, SUA750 Model UPS unit that has been in service since late 2008. Recently, it failed completely when there was no power outage. (If any power outage occurred, it was for only a ...
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1answer
68 views

Intel S2600CP4 Server build, Will not boot. How to diagnose?

I have built a server using this motherboard, upon pressing the power button the fans whur up and lights come on but immediately turn off. There are no beeps, and I have tried a different PSU. I have ...
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90 views

XFX Radeon R7 360 in a Dell Optiplex 380

Will my power supply in an Dell Optiplex 380 let me install a XFX Radeon R7 360 card? I know that it will fit and that I have the correct PCI slot. I also know that I would have to buy a power cable ...
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6 views

Asus x44L Solve the issue of correct plugin

Well, as I recall , I plugged the power cord into the wall before the Asus laptop. This was wrong according to a info message I read when buying my laptop. I could have done this 2 or 3 times before 8 ...
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46 views

hp power supply pinout

Probably the wrong place to be asking this, but yet it seems so right... Has anyone had any experience with power supplies like the dc2100sff's psu? I would like to know what the pinout of the cpu ...
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49 views

Power surge on usb 3.0, usb ports stopped working

Windows reported power surge on usb hub, and since then 4 of my usb ports stopped working, I've tried uninstalling drivers and re-installing them again, but it didn't work. Tried pulling the cable out ...
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81 views

Why are there Fully-Modular PSUs?

I understand the point of Semi-Modular, but with Fully-Modular you really have to attach cables you'd be required to use! Is it only a moneymaking scheme, or is there a point to getting one?
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1k views

I plugged an 8-pin EPS (CPU) cable into the GPU's PCI-E port. Is it damaged?

The r9 290x I wanted to use needs 16 pins, my PSU which I thought had 1 PCI-E 6 + 2, 1 PCI-E 6 and 1 PCI-E 8-pin setups, actually had a second 8-pin EPS cable. I don't currently have something to ...
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2answers
57 views

Laptop wont Switch on.. Power button LED Blinks when I press power button

My Laptop is Lenovo T430. Tried following steps with No luck. Refer to my Video here. Try charging the Battery to Full Remove Battery and tried booting it with Power directly. Changed the Keyboard....
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3answers
119 views

Ditch AC, Plugging a laptop into a car battery

Hopefully I'm asking the obvious; but my computer is important so I would like more opinions. According to the question Laptop battery: is voltage really important to respect? It seemed their ...
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1answer
324 views

Charging a laptop though a USB-C power port with a low voltage/amperage

Let's say we have a new laptop with a USB-C port - like the new Macbook1 or the Chromebook pixel which, yes, are meant to be charged through these ports -, a good solar panel for smartphones (5V 3A ...
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1answer
15 views

Computer turns off a second after powering on

It doesn't even post. No beeps, flashing lights or anything. All the fans spin up for about a second and then it switches off again. I've tried disconnecting everything, so it's just a power supply + ...
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1answer
37 views

Can I add peripheral power connectors to server?

I'm hoping to add USB 3.0 to the server blade that I picked up for personal use. However, it has no peripheral connectors (3.5" HDD power connector), only a motherboard connector (used), and some ...
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1answer
13 views

System woudn't boot, was it the power supply?

My friend gave my an old server from his work (only reason they gave it to me is because its 8 years old, worked when they had it). When I took it home, I couldn't get the thing to post. I was ...
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2answers
502 views

My power cord only charges at a certain angle

So my laptop's battery has been useless so I've made my laptop AC only. Recently, the cord will only give the laptop life if it is at a specific angle. If you were to draw a horizontal line, and from ...
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1answer
97 views

Can a faulty card work fine except sometimes during post?

I have this strange problem. Sometimes when I turn on the computer or reset, the BIOS hangs with debug code 4f (which is labeled in the manual as reserved). It doesn't beep or post, and the usb ports ...
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1answer
5k views

Will A EVGA 500W Power Supply Power a GTX 960?

I am thinking of getting this graphics card for my PC: http://www.amazon.com/EVGA-GeForce-Whisper-Graphics-02G-P4-2966-KR/dp/B00SC6HAS4 I am not sure if my 500W power supply can handle this card: ...
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1answer
39 views

Does cable awg/amps matter for power adapter

I bought a longer cable for my surface pro 3 power adapter, the cable that goes from the outlet to the brick, and I noticed that the power adapter says it takes an input of 1A and the 22 awg cable ...
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1answer
65 views

Can I safely use a USB-Y cable to power a small device?

Say I have a normal USB-Y cable - female and male with data and power connections, and an extra male port with just power connections - normally used to draw extra power from an additional port on the ...
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1answer
82 views

PC will only turn on if I position the PSU ATX power cable in a certain way

The past 3 days I've been trying to fix this issue. I just bought a new motherboard and CPU, but I've ran into a problem. My computer will not turn on unless I'm pulling/pushing/positioning the PSU ...
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1answer
66 views

Micro-ATX power supply screw alignment

Most of the MicroATX cases have an offset top-left screw like this: But most of the MicroATX power supplies I'm finding have a rectangular configuration like this: Which is standard? Are there ...
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0answers
38 views

In order to start my PC I have to put pressure on my EATX power cable

I can't start my computer unless I push hard on the beatx power cable and hold it in a certain position. I'm not sure what the issue is..I got a new motherboard today, as well as CPU so those aren't ...
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0answers
70 views

how come my gaming pc overheats when connected to my tv?

As stated on the question, I have had some rather uncomfortable system failures due to overheating. When I was on my 23" Full HD (1920 x 1080) LED monitor the symptoms have not appeared, but when I ...
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0answers
93 views

Motherboard or PSU causing reboot loop?

Error description: PC will reboot and fans will power up but will immediately restart before getting to BIOS. No display on screen. No beep sounds from speakers. I've been doing research for now and ...
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1answer
123 views

Laptop without battery resets BIOS when ac adaptor is removed

I am using a dell inspiron 15 3537. Here's the thing: If I remove the battery and try to power on, I get a constant beeping sound with screen showing nothing. After that I power it off clicking the ...
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1answer
143 views

Identifing monitor DC power connector

I can't measure it precisely but as far as I can tell male has 6 mm outer diameter, around 4 mm inner diameter and center pin probably 1 mm or so. It's the power cord of an LG monitor. I think it's LG ...
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36 views

Could this be a faulty Laptop adapter or something else?

I have noticed some problems with my laptop's USB ports that I think may be a power problem, though I'm not sure. I have 3 USB ports on my laptop (2 USB 2.0 and 1 USB 3.0). The USB 3 port is on the ...
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1answer
22 views

Are there any safeguards for the case that the ac power is disconnected from a Desktop PC such as an Asus Rog or a small Alienware

Some small form factor PC's such as Alienware (http://www.dell.com/us/p/alienware-steam-machine/pd?ref=PD_OC) or Asus Rog (http://www.asus.com/us/Tower-PCs/ROG-series-Products/) have ac adapters ...
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2answers
281 views

Just built a new computer. Power will not turn on – clicks once, then nothing

I bought a bunch of new parts and put it all together to test it all out, before putting it all into my case. I then assembled everything into my case, attempted to turn it on, and nothing happened ...
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1answer
49 views

PC starts then stops, then starts normally

I have built a new PC very recently and everything seems to be in place. But when I switch it on all fans, including the CPU spins for just one second and stops immediately (it seems like the PC ...
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2answers
301 views

Have I failed the PSU “paperclip test?”

My computer stopped functioning today so I decided to see if it was the PSU. My PSU is a Cooler Master: V750. I performed the “paperclip test” on my PSU and the fan turned on, However it only stayed ...