Beasically this is the problem, from the begining.

I was RUNNING an Asus A7V133 with a Geforce 2 MX 400. I upgraded the videocard to a Geforce FX 5200. The computer started randomly restarting. The best way to describe it is that it is like someone bumped the reset button.

I put the old card back in... the crashing continued. I figured it was time for a new motherboard anyway, and figured maybe the crashing was due to the card being 8x and the motherboard only supporting 4x. (even though the crashing continued with the old card) so I bought a new motherboard. I bought an Asus A7N8X-X.

Crashing continued. I bought a new case with a 400watt powersupply. Crashing continued.

I borrowed a different hard drive from a friend. Crashing continued. I unplugged the CDROM and Floppy. Crashing continued. I flashed the BIOS, updated all the drivers for everything including my mouse. Crashing continued. Did the windows updates (even though it screwed up my sound card. fixed that). Crashing continued. I have reformatted a number of times with XP and even tried 98 once. Crashing continues. I went back to thinking it was the video card. Bought a Geforce FX 5900 XT. Crashing continued. Traded it back in for an ATI 9600 XT. Crashing continued.

Everytime I reinstall Nvidia drivers or remove them, I use detonator RIP to make sure the registry and everything is clear of them.

Now I basically have enough parts for two computers. So I took one day a couple weeks AGO and built them both. The one with all the new parts still crashes. The original computer that the crashing started on (the Asus A7V133 with the second-newest card, the Geforce FX 5200) is running perfectly. It is the same exact setup that the computer started crashing with. The problem seemed to jump from one computer to another.

There is one difference. The hard drive. The system that is working now is using the hard drive I borrowed from a friend. The reason I dont think it is the hard drive though is because like I said, the hard drive was at one point in a setup that did crash. Both hard drives were at some point.

Now the crashing is kind of random. I can just run the OPERATING system fine and it might crash once or twice a day. I can even run Team Speak (http://www.teamspeak.org/) to talk to my buddies online just fine. And the crashing is minimal, but still happens. When I run a graphic intensive game, it seems to crash more often. Anywhere from WITHIN 5 minutes of loading the game or 5 HOURS of loading the game. So I know it has to do something with graphics or maybe system memory. But I can not for the life of me identify it. Once I seem to narrow it down to something, and I think I fixed the problem, it crashes again.

Any thoughts? Any questions?

Oh one more thing. Of the billion crashes I have gotten a BDOS messege twice. A blue BDOS screen saying "DRIVER_IRQL_NOT_LESS_OR_EQUAL" and gives some memory refrences. This has only happened twice. Out of all the times it has happened.

Everything I have looked up about this has not worked or even related to my problem. Some IRQ's are shared, but both the tech support for my Video Card and my Motherboard have said that as long as it is set to an IRQ, IRQ sharing in WinXP is fine.

In short.
Have swapped motherboards (including ram and cpu), video cards, sound cards, hard  drives, cdroms, floppies...I am exhausted. Been working at this for about 3 months now.

Any help would rock. Thanks a ton.

-BenWell sounds like you have tried a lot of combinations... What operating system are you using?  With regard to putting a 8X card into a 4X slot did the rest of the system even meet video cards minimum requirements.  What are the processor speeds?  Have you considered updating the BIOS? RUnning XP, but have also tried 98.

Yeah have flashed the BIOS and even reset it.

Minimum requirements? Not positive, but like I said it is running perfect now on that system.

CPU... on the old system is a 1.33 Ghz   new one is a AMD 2700 (think that is 2.16)