Replies to my previous post indicated the reason my pc was freezing & having display problems was likely due to overheating. I took the advice to remove heatsink & fan, clean out dust. Cleaned out whole interior, though there wasn't much dust at all. Cleaned off the old thermal paste, but didn't have replacement paste so I replaced without it (was later advised paste IS required).
I was monitoring temperatures using Speedfan and HWMonitor. Temperatures were never very high (GPU 50-55 max, Cores each about 40-50. A bit higher when playing games). Computer was running very smoothly. I also took a few unnecessary programs out of Startup and that helped.
A couple days later, the computer froze and had display problems. I didn't get my shipment with thermal paste yet so I went out & bought some (Arctic Silver Ceramique). Once I cleaned the heat sink & cpu again & applied paste, and reseated the heatsink, the computer was working fine. For a while!
But once anyone started playing video games, the problems happened again. I thought maybe there was a problem with the way I put the paste on, too much or something, so I redid all of that, and it worked fine again for a few hours. But then it froze again & had display problems after a short while.
We were able to restart and use the computer a couple times, but then it would start freezing again, having display problems etc, until eventually it would not boot back up at all.
After unplugging and waiting a few minutes, and trying to reboot a few times, I was able to boot and get into BIOS ( I wanted to find the company name to check the POST beeps -It's AMI). Everything looked okay that I could tell, temperatures seemed fine etc. Then when I went to load Windows, it froze again. Waited and tried again many times, the computer would not boot again, just one long beep then nothing.
The next day I tried to reseat the heat sink one more time. I cleaned everything, put new thermal paste, and everything started up fine again. I don't understand why this would fix the problem, even if only temporarily. Only used the computer for basic web searching, and the temps were fine for 2 hours, nice & cool.
Then we tried a game once again. The computer froze, and we have not been able to get the computer back on since. Reseating heatsink a couple times (cleaning & replacing paste each time), even tried to reseat the CPU too. The only thing that happens now is the power supply/fan turns on, the heatsink fan turns on, but the only sound is a long beep (about 4-6 seconds) and then nothing - no display on screen and no other sounds. The power button flashes, slowly dims and brightens, but nothing else.
I don't know what else I can try besides what I have already done, over & over. I had planned to upgrade anyway so a new power supply unit is on its way, along with a new graphics card and a case fan. I will order a new heatsink & fan as well.
The last time I poked in the case, I noticed the heatsink on the motherboard - is this where the onboard graphics would be? - was warm, even though the computer had not been on for awhile (I had turned the computer on & off many times as I reseated heat sink etc, but the computer had not been powered up for hours).
Can this be a CPU issue? Overheating onboard graphics (is that possible?), or other graphics issue?
I am completely out of ideas with my limited computer knowledge. Any help would be greatly appreciated!
Edit to add: As these problems started in past couple weeks, when I rebooted I usually had the option to Launch Startup Repair. Whenever I chose this option, I would get the Blue Screen. I just rebooted and loaded Windows normally, which worked fine except as noted above.
Edited by JadedGem, 03 October 2010 - 09:42 PM.