Here is interesting problem for someone MUCH smarter than I am.

I been having some serious problems lately with my monitor while PC gaming. After playing just about any game (although the two I've been playing recently are Fallout 3 and Warhammer 40k Dark Crusade) the image on my screen will suddenly become scrambled beyond recognition. Oddly enough, this doesn't appear to have any affect on the game, which continue to run as if nothing has happened. If I hit alt-tab on my keyboard to get out of the game, and then alt-tab to get back in, the image is restored (although some games, like Fallout 3, don't take alt-tab very well and sometimes crash at that point). When the problem first started, it only happened occasionally; I didn't worry about it too much because it was only a minor nusance (unfortunately, this means I don't remember much about when it started happening). Over a period of about 2 to 3 months it has gotten increasingly worse, and now happens every 5 to 10 minutes.

Here's a list of the solutions I've already tried; I'm not a certified computer expert by any means, so you might get a kick out of some of these:

I downloaded the latest drivers from nVidia for my graphics card: no results.
I attached my computer to a different monitor (one which used a different type of input cable): the problem remains.
I wiped my hard drive and reinstalled Windows XP Home: the problem still remains.
I updated the drivers for my chipset and flashed the BIOS: glitch still there.
I disabled SLI and removed one of my graphics cards: problem continues.
I swapped the graphics card I removed for the one still in my machine: no luck.
I disconnected my SPEAKERS and even unistalled my audio drivers: no joy.
I downloaded a 3rd party Xtremem-G graphics driver for my card to replace the normal nVidia driver: Kobayashi Maru.
I OFFERED a sacrifice to the god of technology: he mocked me mercilessly.

Here are the specs for my computer:

MOTHERBOARD: ASUS A8N-SLI Deluxe
Processor: AMD Athalon 64 X2 Dual Core 4400+
Graphics Card(s): GeForce 7900 GT KO
Ram: 2 Gig
Hard Drives: 2 Western Digital Raptor SATA Drives in RAID
Power Supply: 620W

As I mentioned earlier, the strange thing about the problem is that it doesn't seem to have any DIRECT impact on the game running. The computer doesn't STALL or freeze up -- it doesn't seem to realize that the image on the screen is scrambled. I've gone so far as to take a "print screen picture" when the monitor image is scrambled, and the picture looks fine (no scrambling at all). Temperature doesn't appear to be the problem; according to the ASUS Ai Booster program temperature levels are normal. I don't overclock. I've scanned for viruses, haven't found any. This problem only seems to kick in when I'm playing a game; internet browsing and Offices application appear to be totally unaffected. To say that I'm frustrated is something of any understatment. Please help if you know how to solve this problem.