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PC turns on but no display on monitor

Hi all,

A few days ago my PC suddenly started acting all laggy - as if everything was in slow motion. Opened windows would close slowly....minimize slowly...FPS in games would act as if the games were minimized...the initial motherboard beep instead of a short beep was a loooong one and Windows would take minutes to start up (when I did a hot reset)...

I then powered off the PC completely, waited 15 minutes and powered it back on. The initial motherboard beep was normal (short), and everything worked fine. Then suddenly while browsing for solutions everything froze, and I had to do a hot restart again. This time beep was normal, all HDD sounds were normal, the Windows opening theme was playing too...but no monitor image displayed whatsoever. Did another hot reset, PC powered on fine except for two black bars right and top of the motherboard start screen (during the MB beep). Everything else was fine.

Turned it off for the night, and the next two days were normal. This morning however when turning it on, the same no-picture issue occurred (although everything else within the PC tower was running as usual, and Windows startup sound played). Hot reset it and the screen image appeared..and I'm now writing this. While the monitor was not displaying any image its power LED was blinking as usual (it was getting plug power thus) and I tried moving the mouse to "wake it up", also turning it off then on again and pressing the Auto button on it an wiggling (lightly) the cables. None worked, only the PC restart brought life to the screen.

Tried looking for solutions but they vary so much that I'm left bewildered.

setup: 4-year old PC, Windows 7, Nvidia GTX 560, 8Gig ram (2 slots). Used mostly for non-intensive tasks (MS Word, Photoshop) with the occasional gaming hours during some evenings.

Thank you kindly.

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All Answers

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Google this.

In reply to: PC turns on but no display on monitor

"The Dead PC."

You find that troubleshooting a dead PC is done by stripping it down until something works then you add a part, retest and repeat until you find the bad part or parts.

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Can't be sure if it's a part or it felt like working

In reply to: Google this.

Any advice to replicating the issue consistently? Not that I want my PC to have issues but I can turn it on 20 times and not get an issue and then turn it on the 21st time and get it, based on the amount of times I've restarted it the past few days and it only appeared this morning on first power-up. I can't know for sure if it'd work due to a piece being stripped or it worked because...it wanted to work on that particular startup?

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I didn't catch that in your top post.

In reply to: Can't be sure if it's a part or it felt like working

The random fail like that usually has me:

a. Checking the PSU. I look at its age and number of rails then rating. Split rail designs are just binned. We don't like those.
b. Actually in parallel or same time (?!) we check the motherboard and other cards for BAD CAPS. BAD CAPS (see google) can cause random cold start problems. Fix? We replace the board. We can't issue any warranty on cap replacements.

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