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Ok, goddamn computer.
So what happened is my computer just straight up turned itself off out of the blue. Now, when I attempt to start it up, all the fans will spin up just like normal. It sounds like its starting, but then it will turn off again, then about 2 seconds later all the fans will turn on again and it will sound like its starting a second time, but this time it will stay on as if its running. The problem being that there is no video output or any sort of signs of life other than all the interior components whirring along.
I opened it up and everything appears functional from to the eye, Mobo lights, cpu fans, Gpu fans, harddrives spinning, everything powered. But again I can't get any video output or anything.
I just recently replaced my old power supply which kicked the bucket after several years, and the new one seems to be working fine except for the wierd power on power off power on thing. I checked the obvious things connections and everything should be fine, I didn't just kick the monitor cable out.
So basically what is likely to be fucked? MOBO?
TLDR:
press power
everything starts whirring and starting sounds
powers down by itself
powers back up by itself 2 seconds later
remains "running"
no computer magic coming out mah screen 
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My guess, since everything seems to be running, is to check with a different GPU or a output port on you MOBO (if it has one) cause it sounds like an issue with the coonection from the pc to the screen (maybe also try a different monitor and/or cable)
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Does your mobo used to make a BEEP after the POST?
If yes, does it still do it?
If it used to do it and it does not do it anymore, then you know your MOBO is the problem.
if no(as in it never ever beeped) than proceed checking with another CPU.
If your motherboard post normally then it's something with your video output. Was your computer hot when it auto shutdown? if yes you might had an overheat.
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Do you have integrated graphics on your motherboard you can use? Try removing your gpu and booting with the integrated graphics.
Make sure all external devices (keyboard/mouse/pci cards) etc are unplugged, it can cause funky issues sometime with shorts and whatnot in a damaged mobo.
Try replacing the psu if you have a spare lying around, although I doubt this is the problem.
You don't get any beeps when booting? Also, could you please post your computer specs?
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What parts are in the computer?
Some ASUS do this dual boot thing when it cant find an OS, or a couple other things as well.
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On January 12 2013 03:02 Medrea wrote:
What parts are in the computer?
Some ASUS do this dual boot thing when it cant find an OS, or a couple other things as well.
HIS Radeon 4870
Intel Q6600
Asus P5Q - E
I dont think it ever beeped on startup...it definitely isn't now. Ill go trysome of your suggestions
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Am I right that the P5Q - E has no integrated graphics?
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If it never beeped on startup, chances are you don't have the system speaker connected. Verify that it's connected, then restart again. Beep codes (check your motherboard manual) give a quite accurate indication about the cause of the issue.
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Uh... could it be the monitor? Though I doubt it's as simple as that, seeing as it powers back down. It's probably a problem with the mobo.
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I dont have a system speaker, I'm gonna try swapping my roommates gpu.
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i had a similiar problem with an acer extensa 5630z where i pressed the on button and it kept on and off whithout screen image. i my case it was the chipset that gave up
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First step (works for me sometimes) -
Look at your power supply. There should be a switch (usually red) with 115/220 on it. It should be set for your incoming voltage, so in US that would be 115. Unplug the computer. Then move the switch to the other setting (220), and then reset it back to 115.
While it's unplugged from the wall, press and hold the power button for 10+ seconds.
Plug it back into the wall, and try powering it on.
I don't think your problem is going to be software related. If the above doesn't work, open up the case and take a good, close look at your motherboard. You're looking for something that would look like... this; check your capacitors. While you're doing this, try re-seating everything.
It sounds like a problem I'm familiar with, either power supply effing up or the above mentioned bad capacitors. (Or capacitors going bad.) What kind of computer is it? Brand name, home built, etc?
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I'd guess Mobo or PSU.
More than likely PSU. Try booting with a friend's PSU and see if that works.
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On January 12 2013 04:47 sob3k wrote:
I dont have a system speaker, I'm gonna try swapping my roommates gpu.
The "system speaker" he's referring to is on your motherboard, and only makes beeps, depending on what happens when your computer's startup sequence occurs. Different beep codes mean different errors, 1 beep is normal. I'm not sure you can even disable the speaker without cutting wires on a normal motherboard.
And they've been around for a very long time, you should have one 
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On January 12 2013 06:18 Rollin wrote:Show nested quote +On January 12 2013 04:47 sob3k wrote:
I dont have a system speaker, I'm gonna try swapping my roommates gpu. The "system speaker" he's referring to is on your motherboard, and only makes beeps, depending on what happens when your computer's startup sequence occurs. Different beep codes mean different errors, 1 beep is normal. I'm not sure you can even disable the speaker without cutting wires on a normal motherboard. And they've been around for a very long time, you should have one
That's exactly what I meant Tnx Rollin.
And although it might be common nowadays to have the speaker integrated in the motherboard, I do believe older computer casings provided their own speaker. In that case you have to hook them up, in the same spot your power button, reset button and front end audio plugs are connected to the motherboard. ~12 little pins sticking up on the motherboard, each pair designated for a separate function like power, reset etc. System speaker should be there.
But maybe I'm too oldskool for this shit, been using laptops for years. Anyways, good luck!
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Surprised no one has told you to bench test it yet. Try that and narrow down your problem one piece of equipment at a time. If that doesn't yield any results it's probably the power supply or MOBO (try resetting the CMOS if you changed any of your settings recently). Other than that the bench test should narrow it down to the real issue, This has helped me find faulty RAM and a BIOS chip so far.
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On January 12 2013 06:56 Jambo101 wrote:
Surprised no one has told you to bench test it yet. Try that and narrow down your problem one piece of equipment at a time. If that doesn't yield any results it's probably the power supply or MOBO (try resetting the CMOS if you changed any of your settings recently). Other than that the bench test should narrow it down to the real issue, This has helped me find faulty RAM and a BIOS chip so far.
Doesn't normally come up as the first thing in my mind - but then when I'm thinking of bench testing it involves specialized equipment that most people don't have. (Even something as simple as a voltage meter.)
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Personally i would strip the computer down to the bare minimum (CPU, MoBo, PSU, GFX, 1 RAM module) and disconnect everything else. Try to power up, if still nothing shows on your monitor, then its one of the above components (or Monitor/Monitor cable) Next step would be to switch one component at a time with a known to be functional part.
Also faulty capacitors dont always indicate a faulty mainboard. My computer died, i found some faulty capacitors, still it was actuallly the PSU that was the cause of the malfunction.
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A silly question, have you plugged our computer off for a few minutes to let the capacitors drain?
If not, try it.
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EPT
