Hello! I've done a search over the Internal Hardware forum to try and find a solution to my problem, but didn't find anything, so I figured it wouldn't hurt to ask.
My system specs are:
ASRock 970 Extreme4
AMD FX-8350 w/stock cooler
2X Corsair XMS 4GB DDR3
Raidmax Hybrid 2 RX-530SS 530W PSU
Asus GeForce GTX 760
WD Caviar Green 1TB HDD
Windows 8.1 OEM
It's my first custom PC, which I've had for about ten months. Nothing is overclocked, and I just reinstalled all the drivers. Earlier in the week I put an air conditioner in the room my PC is in (my bedroom) and moved my PC from on top of my desk to the floor beside my desk. It still has plenty of ventilation, the environment is constantly at 70 degrees Fahrenheit, and the insides have been cleaned. I mention this as my first thought when I began having issues was it being linked to poor ventilation or overheating, since I had just moved my PC to the floor.
All my issues started happening at once. Firstly, when I try to start my PC, the fans begin to run, but it takes between one and three minutes before my mobo posts and my BIOS boots. From there, Windows loads without any further delays, and startup seems to have no issues.
However, after about half an hour, things stop responding. I will click on a program (any program, Steam, games, Chrome, VLC, Paint, Notepad, Libreoffice, etc.) and either the process will start (but no program window launches) or the program starts up but hangs a second into starting, and immediately stops responding. If I open up task manager, I can see a large amount of RAM being used (usually up to 125 MB, no matter the program) but no CPU usage or disk usage.
In the few days before this started, I was trying to troubleshoot another issue which may or may not be related. I could be in a program (most often in games, specifically Magic 2015 and The Secret World: it seemed to consistently happen more often in these than anything else) and suddenly the screen would freeze and all sound would stop. If I was on Skype or Teamspeak, the calls would be dropped. If I did nothing, my USB keyboard's lights would remain on, but if I hit a key, the lights would turn off. On the other hand, my USB led-lit mouse's lights would stay on even if I clicked the buttons. Unplugging and replugging would not turn the keyboard's lights back on, but would allow the mouse's lights to turn back on. During all this, all my components' lights stayed on, and the fans stayed on. Holding down the power button would not turn the PC off, and I would need to use the PSU switch to restart the PC. I could open a Splashtop streaming session on my iPad (so the service was still running), but the screen would be black. After the PC booted again, event viewer would only show 'unexpected shutdown' as a critical error, nothing having to do with driver failure.
To attempt to fix the problem, I have uninstalled everything installed in the last few days, done a few scans with Norton 360, (including a rootkit scan) removed as many startup processes as I could, uninstalled most programs which weren't games or for art creation, (Specifically uninstalled Raptr and Razer Experience which I thought might be interacting with each other poorly) flashed my mobo, done a CMOS reset, uninstalled and reinstalled all my hardware drivers, cleaned the insides of the PC with canned air and a vacuum, moved the air conditioner to a further away socket in case that had anything to do with it, made sure the environment was cool, (my fans are hardly working hard even in games when I keep the room cool, so I don't think it's an overheat issue) cleaned my registry, defragged and done a disk cleanup using CCleaner when I could, and restarted my PC more times than I care to count.
I have no idea what's going on, but hopefully someone can help me who's more experienced with PCs than I am.
Thanks in advance,