INCREDIBLE instability, need diagnostic help.

[Panda Man]

My system as of today, has become 100% unstable. Specs in sig. Dust was beginning to build-up in my system, so I got a can of compressed air and gave it a good cleaning. The only thing I took out was my video card. After reseating and getting the side panel back on, i hit the power button and lights came on, but the monitor remained off. From instinct, I flipped my monitor off and back on just to make sure it was alright, and it was. What would happen was that the all the lights would come on, my cd drive's light would flash a tad bit longer than normal, my hard disk activity light would stay solid for a long time, until eventually the floppy would kick in and the floppy light staryed green the whole time. Now i am beginning to crap myself. I turn the tower on it's side and open the panel to see if I troubleshoot it. I decided to turn it back on one last time to make sure everything (especially the video card) was running fine. When i turned it back on, presto! It's running fine, and windows loads. Assuming maybe something was loose, and that by putting it on its side it got shaken back into place when i put it on its side, I righted my tower and went back to reboot. After rebooting, the monitor remained turned off, and I was back at the beginning. I flipped it back on its side, and rebooted fine yet again. After windows loaded, i decided to test the stability of it and tried to run CoD2, and as it was loading it froze, and when i tried to get in the task manager, really wierd images popped up on my screen, and I had to reboot. Now im back to square one again. After righting it, putting it back on its side, righting it again, and placing it back on its side one more time, it booted up fine =O. I then ran Memtest86+ to check my RAM, and after 2 passes i declared my ram stable. Then i ran MAXBlast to check my HDD for errors, and it too was fine. So when i got into windows, i was beginning to be very optimistic about what the problem could be. So i logged in as administrator, and I backed up the important stuff in my registry and back my user account so i could format if needed. Afterwards, i opened up Linksys' monitor thingy for their 802.11g wireless cards, and all of a sudden the brightness on my screen SOARED all the way up (to the point i almost couldn't see anything) and the comp rebooted again. Now Opened the case again, reseated me video card, reseated the RAM, and checked all my connections (something i should have done earlier) and tried to turn my comp back on. No go. So i reset the CMOS, and now its working fine. Now it seems to be somewhat stable, however CoD2 still won't load, Firce is also unstable, and i fear i will probably be seeing these problems again in the near future. Any idea as to what the problem might be? All i can think of is either my Video card or MoBo is faulty, or Windows just needs a clean installation. Also, if it helps at all, the only real change that has happened up until these problems is the install of starforce, and from what i hear, that stuff can really screw you over.


EDIT nvm, CoD2 and firefox, and pretty much everything else is running fine now. Im still very insecure about running my PC in its current state however. Any ideas as to what might have caused this other than a corrupt BIOS?