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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46 views

Do USB power supplies send signals indicating energy level being delivered?

Do USB power supplies send signals to tell the connected device (tablet/phone/camera) how much power is being supplied? Or, is measuring it the only way for the device to know how much energy is ...
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28 views

Laptop Power Supply with detachable cables

I have an Acer laptop which gets a lot of use. The problem is the charger. Due to wear and tear the cable has split (see photo). I could easily get a replacement power supply, but I'm wondering if ...
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56 views

CPU fans gradually turn to max power, unusual PSU & motherboard config

https://drive.google.com/folder/d/0B0ijOBuJiVJnQ1ZLdUlRQTlkY28/edit I am giving an old PC of mine away, and decided to turn it on one last time before I gave it away. The fans start out silent and ...
3
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38 views

Pc will not boot - power over HDMI?

So i encountered the strangest issue with my PC today. I was using it last night, i shut it down as normal, then this morning, nothing, checked power leads, tried to remove power hold in power for 30 ...
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6 views

Laptop screen flickers but more in the night

Asus VivoBook S301LA running Ubuntu 14.04 64-bit The problem mainly occurs on websites which are graphic/image intensive. The problem mainly occurs in the night. I may have a flickr an hour in the ...
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10 views

Debugging Sound Issues with new hardware

I recently upgraded my graphics card and power supply (needed more for the card) and now I get some pretty weird sound issues. Playing over my headphones sound only has issues with certain things, ...
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852 views

“The current input timing is not supported..”

I recently had the PSU changed on my dell inspiron 545, and now whenever I boot up I get the following message: "The current input timing is not supported by the monitor display. Please change your ...
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49 views

ASUS M4A87TD/USB3 Power Problems

M4A87TD/USB3 motherboard, AMD Phenom 2 CPU, 8 gig ddr3, Zotac Gtx660 2 gig graphics, Point ATX 12V 750W PSU, Onboard sound, lan etc, I had a random complete system shutdown with no warning. I ...
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99 views

X220 sudden power off and other power issues

In the past week or so, my Lenovo X220 laptop (bought in mid-2011) started to give some power troubles. The first time, it just suddenly turned off completely without any warning (no blue screen, no ...
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3answers
100 views

How do I diagnose a hard Linux crash?

I have a home-built Linux server (Ubuntu 12.04.5 LTS, Intel i5-3570K, 8GB RAM) acting primarily as a mail and web server. It operates in console mode only (no GUI). I will SSH to it now and then, ...
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34 views

When I turn on my PC,why it spins for a second then restart automatically? (when I unplug and plug in back the power cable)

I have recently built a custom PC, it works (I think) very well other than the issue below. Since I just built it, I was still playing around with that (changing fan positions, adding new fans, etc.. ...
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58 views

Computer randomly gets into power loops

A few weeks ago my original power supply, Corsair AX760i, started randomly getting stuck in power on/off loops. It would reboot, the fans would spin up then shut off after 1-2 seconds and repeat. It ...
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60 views

One power supply per graphics card

I'm planning on buying a new R9 280X, to crossfire with my current one. However, I have a 600W PSU which may not be able to supply sufficient power for both, as each ~300W require under load, and the ...
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1answer
37 views

Laptop is not turning on with working charger

When I am connecting the charger to the laptop, the laptop is not charging (LED light is not on) and LED on the adapter/charger also turning off. I don't know what could be the problem? Things I ...
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38 views

New PSU makes noises, but only for a few minutes

A few days ago, I bought and installed a new power supply unit, the "Be quiet! Pure Power CM BQT L8-CM-630W". Since then, a few minutes after booting the PC, it starts to make a noise, which I have ...
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1answer
107 views

3.3V and 5V rail in modern PC

These days in ATX PSU these voltages come from a single rail and have fixed amount of current. Seems like they do not affect the PC functionality these days. I know that USB port use the 5V rail ...
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1answer
39 views

Pc case instructions say screws for Psu should have come with Psu but it says the opposite

Basically, I'm building a Pc and all I have bought so far is the MOBO, the Psu and the case. Im trying to assemble it in an order that I can see if a part isn't working and return if not because I ...
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50 views

Weird Laptop Power Connector

I just received a laptop without a power cord. I decided to go out and buy a power cord, but This type of DC jack is completely foreign to me. Does anybody know the name of it, or where I might be ...
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47 views

Sudden computer restarts(already replaced PSU)

So, this computer problem has been driving me crazy for the last year or so: every so often while gaming(if I game intensely for ~10 hours it happens once or twice), usually on the parts that seem ...
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20 views

Trigger task when unplugging power cord

When I leave my office and taking the laptop, I'm always forget to take the power cables. I am searching how to trigger a short beep (mp3 file), any time I unplugg the laptop. Prefer that it will ...
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2answers
195 views

Is it safe to use AC power adapter of 6.7A or 4.62A instead of 3.34A

I have Dell Inspiron 5520. I have a problem with the power adapter and I want to buy new one. I saw that my charger amperage is 3.34A (65W) but there are also adapters with 4.62A (90W) and 6.7A ...
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19 views

Make laptop turn on automatically

I have a laptop of IBM X41. I want to use it in a project in making in which it will be used as kiosk. If power goes out and comes back I have to press the power button to turn the computer back on. ...
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33 views

FPS Skips due to Power Issues, is there anything I can do on my own to fix it?

My laptop skips frames. I tried to pin-point the issue and I finally have. My gaming laptop (Asus, 17.3", GTX 960m, 4gb, 12GB, i7-4k, SSD). It used to work at full-speed (All Max SC2 at ~100 fps), ...
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1answer
69 views

My old monitor Samsung Syncmaster 740n needs 2-3 min to turn on

When I power on my old monitor Samsung Syncmaster 740n, it needs needs 2-3 min to power on. When it turns on, it works fine. What can be wrong with it and if it possible how to fix it?
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23 views

Why did this PC power supply stop functioning?

I have an old PC power supply which I want to use because it outputs 12V and 5V very nicely. 12V is the yellow wire (this is all labelled on the power supply itself), 5V is the red wire and ground is ...
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1answer
64 views

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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1answer
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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36 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
33 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
30 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
34 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
142 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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23 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
391 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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1answer
95 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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61 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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30 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
70 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
106 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
45 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
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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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88 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
61 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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79 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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40 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 ...