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Computer turns on, black screen, keyboard and mouse doesn't work

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August 1, 2013 6:47:36 PM

So I was playing games today, and I decided to shut the computer down as I left my home, and after I came home, I tried to turn it on, but I only got a black screen + keyboard and mouse were not working and not lighting with their green and red colors.
August 1, 2013 7:08:57 PM

did the fans and components turn on? where there any beeps and did you see a post screen?
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August 1, 2013 7:22:10 PM

Hi sir, the fans are working, no beeping sound, and no message on screen.
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August 1, 2013 7:24:58 PM

Amir Arfan said:
Hi sir, the fans are working, no beeping sound, and no message on screen.


are you sure your monitor is on and working correctly? have you tried plugging anouther device in to make sure the issue is not your monitor?
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August 1, 2013 7:28:38 PM

Yes , I have tried with two different monitors one vga and one hdmi, tried replugging the RAM too.
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August 1, 2013 7:33:06 PM

Amir Arfan said:
Yes , I have tried with two different monitors one vga and one hdmi, tried replugging the RAM too.


are you using integrated graphics, or a seperate video card? do the fans and (lights?) on that card turn on?
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August 1, 2013 11:07:33 PM

Amir Arfan said:
So I was playing games today, and I decided to shut the computer down as I left my home, and after I came home, I tried to turn it on, but I only got a black screen + keyboard and mouse were not working and not lighting with their green and red colors.


This happened to me too today, though i have no idea how to fix it. Did this by chance happen when running a program through steam?
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August 2, 2013 6:49:34 AM

I am using a graphic card I bought, and its fan is working and the light is shining green, and yes i was downloading something on steam when I shut down the computer.
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a b B Homebuilt system
a b à CPUs
a b V Motherboard
August 2, 2013 7:14:02 AM

If they were no beeps at all when you turned it on, it means that it failed to POST (Power-On Self Test).

This usually means that something big is going on, such as a faulty PSU, that the RAM or CPU aren't properly placed, things like that. Is there any chance that something might have happened while you were away? (ie. a power surge, someone accidentally hitting the case, etc).

If the answer is no, open it up, clean it all with compressed air, and check all connections, and try again. Sometimes what causes this is not the PSU itself, but a faulty connection with the motherboard.

If all else fails, try to borrow a different PSU and try.
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August 2, 2013 8:03:51 AM

So I tried to run with my older pcs psu and I had the same problem :/ 
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a b B Homebuilt system
a b à CPUs
a b V Motherboard
August 2, 2013 10:17:45 AM

That's tricky. Still no beep at all? Probably the motherboard's the cause then.

If you still have your other PC around you might try putting your newer PSU on the older PC and check if it goes, just to rule out any PSU problems. If it works you can put it back and be sure it's good.

Also try removing any unnecessary periphals (CD Rom, PCI cards, if you have integrated video then also remove any discrete video cards). Take out the RAM sticks and put them back on, probably on different slots. Unplug everything (SATAs, fans, etc) and then plug it back. All this while cleaning with air. And try again.
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August 2, 2013 11:14:00 AM

Try removing and reinserting the button cell battery that drives the real time clock. I've seen this happen several times, and for some reason this fixes it. Make sure there's no corrosion on battery, and if possible measure it with a volt meter to make sure it's still at 3V.

If that doesn't work, reseating the RAM is always a good thing to try.
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August 2, 2013 11:40:58 AM

I checked if its still 3V and yes it is, and I also reseated the RAM, even tried to run it with one stick and different RAMs, but didnt work, I still got warranty, but would be better to know whats the faulty, my brother that works with hardware said it looks like its the MOBO, gonna try returning and getting a brand new one, if that doesnt work, I will have to check other parts.
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August 2, 2013 11:41:02 AM

I checked if its still 3V and yes it is, and I also reseated the RAM, even tried to run it with one stick and different RAMs, but didnt work, I still got warranty, but would be better to know whats the faulty, my brother that works with hardware said it looks like its the MOBO, gonna try returning and getting a brand new one, if that doesnt work, I will have to check other parts.
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Best solution

a b B Homebuilt system
a b à CPUs
a b V Motherboard
August 2, 2013 11:43:59 AM

It's gotta be the MoBo. If you already tried with a different PSU and RAM, checked voltages, and still fails to POST, there's no other way. If it was the processor, it would beep a warning.

Send that MoBo to warranty.
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August 2, 2013 5:06:36 PM

Amir Arfan said:
I am using a graphic card I bought, and its fan is working and the light is shining green, and yes i was downloading something on steam when I shut down the computer.


steam is a reputable program and is not the source of the problem. theoretically, If all lights are green and there are no error codes or anything, it should be fine, but it is clearly not. have you tried using a different port on the video card? also, have you tried moving the card to a different pci-e x16 slot?
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August 3, 2013 6:33:38 PM

Actually I just realized that the motherboard wasn't giving out any power to the usb ports or the graphic card, but the fans worked. So it didn't give any power to the ports, which it is supposed to do, so I will have to call the shop and send the motherboard back for a repair/replacement.
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a b B Homebuilt system
a b à CPUs
a b V Motherboard
August 4, 2013 8:46:49 AM

Yeah, it had to be the MoBo. Sorry about that, but at least you already pinpointed the cause of the problem. Good luck on the new MoBo.

Don't forget to close the post, cheers!
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August 8, 2013 11:32:49 AM

Yup, got a new MOBO from the shop, they gave me the money back, it was the MOBO.
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a b B Homebuilt system
a b à CPUs
a b V Motherboard
August 8, 2013 7:48:50 PM

Amir Arfan said:
Yup, got a new MOBO from the shop, they gave me the money back, it was the MOBO.


:D  Enjoy your new rig. Cheers.
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July 22, 2014 10:58:06 AM

tylerj913 said:
Amir Arfan said:
So I was playing games today, and I decided to shut the computer down as I left my home, and after I came home, I tried to turn it on, but I only got a black screen + keyboard and mouse were not working and not lighting with their green and red colors.


This happened to me too today, though i have no idea how to fix it. Did this by chance happen when running a program through steam?


I have this exact same issue. My computer died Saturday the 19th of July. I was downloading games from Steam when I left the computer on. Came back to a black screen. Only way I can power off the machine is to shut off the PSU or unplug it from the wall. No power to my usb ports, no boot screen on my monitor, all of the fans and lights inside the case come on. Can give more information if necessary but would really prefer to not have to switch out my Mobo. Seems really weird 3 of us have had this problem occur while downloading from steam.

I had just reloaded Windows 7 Home Premium 64-bit the day before and installed all of the updates (150+ of them, 'cause holy cow). Only things on my computer were the OS, Cisco N600 wireless adapter driver, XFX Radeon 6950-CNFC driver, and steam (which happened to be in the middle of downloading about 80 gigs of games).
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August 5, 2014 2:28:11 PM

AVengur said:
tylerj913 said:
Amir Arfan said:
So I was playing games today, and I decided to shut the computer down as I left my home, and after I came home, I tried to turn it on, but I only got a black screen + keyboard and mouse were not working and not lighting with their green and red colors.


This happened to me too today, though i have no idea how to fix it. Did this by chance happen when running a program through steam?


I have this exact same issue. My computer died Saturday the 19th of July. I was downloading games from Steam when I left the computer on. Came back to a black screen. Only way I can power off the machine is to shut off the PSU or unplug it from the wall. No power to my usb ports, no boot screen on my monitor, all of the fans and lights inside the case come on. Can give more information if necessary but would really prefer to not have to switch out my Mobo. Seems really weird 3 of us have had this problem occur while downloading from steam.

I had just reloaded Windows 7 Home Premium 64-bit the day before and installed all of the updates (150+ of them, 'cause holy cow). Only things on my computer were the OS, Cisco N600 wireless adapter driver, XFX Radeon 6950-CNFC driver, and steam (which happened to be in the middle of downloading about 80 gigs of games).


Exact same thing happened to me, your post mirrors exactly what I would have written. Brand new computer, works for 5 days, downloading games overnight, and suddenly none of the ports receive power, no boot on screen. I just replaced my motherboard 10 minutes ago, and its still the same. Won't work.

If you find anything that works, PLEASE reply to me and tell me what it is.
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August 5, 2014 2:34:50 PM

AustinL said:
AVengur said:
tylerj913 said:
Amir Arfan said:
So I was playing games today, and I decided to shut the computer down as I left my home, and after I came home, I tried to turn it on, but I only got a black screen + keyboard and mouse were not working and not lighting with their green and red colors.


This happened to me too today, though i have no idea how to fix it. Did this by chance happen when running a program through steam?


I have this exact same issue. My computer died Saturday the 19th of July. I was downloading games from Steam when I left the computer on. Came back to a black screen. Only way I can power off the machine is to shut off the PSU or unplug it from the wall. No power to my usb ports, no boot screen on my monitor, all of the fans and lights inside the case come on. Can give more information if necessary but would really prefer to not have to switch out my Mobo. Seems really weird 3 of us have had this problem occur while downloading from steam.

I had just reloaded Windows 7 Home Premium 64-bit the day before and installed all of the updates (150+ of them, 'cause holy cow). Only things on my computer were the OS, Cisco N600 wireless adapter driver, XFX Radeon 6950-CNFC driver, and steam (which happened to be in the middle of downloading about 80 gigs of games).


Exact same thing happened to me, your post mirrors exactly what I would have written. Brand new computer, works for 5 days, downloading games overnight, and suddenly none of the ports receive power, no boot on screen. I just replaced my motherboard 10 minutes ago, and its still the same. Won't work.

If you find anything that works, PLEASE reply to me and tell me what it is.


Hi AustinL. What I eventually ended up finding was that one of my RAM sticks had gone bad. It was, of course, the very last component I took off my motherboard too. I would try unplugging everything except a monitor and a single stick of RAM and seeing if the motherboard will load anything at that point. Hope that's helpful. Best of luck to you.
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13 minutes ago

Hi, So I had this exact problem today. I was downloading from steam and left the room, my monitor went into power save mode so I wasn't shocked when I came back and the screen was black however it never came back one when moving mouse or pressing keys ect. I tried numerous reboots but nothing seemed to be getting power, everything else with the computer sounded like it was booting up. I found on an old forum about some bloke unplugging the power source, switching it off and waiting 5 minutes before switching it back on. This actually worked for me. I have no idea what has happened but give that a try.
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