Specs:
Biostar M7NCD Pro
Athlon XP 3000+
Powercolor Radeon 9600 Pro 128MB
Thermaltake PurePower 420W
60GB 7200RPM Maxtor
Here's the story. My brother's PC is having problems with a few..maybe just one game. After playing for 20 minutes or so, the game will exit back to Windows, sometimes with an error message (the one where ms asks you if you want to report it) and sometimes no error message. He was not using the latest video card drivers, so I downloaded the latest ATI had to offer and installed them. Now it seems almost EVERY game he tries to play is exiting back to Windows at some point...all except Halo. Then I tried Omega's latest offering...no improvement. I then thought it could be the RAM since he was using 2 differnt types (1x512MB PC2700 Crucial, 1x512MB PC3200 Ultra). Before I took 1 stick out, I relized that I had one stick in slot 1 and the other in 2. If I put one of them in the 3rd slot, dual channel is supposed to work.
So I moved one to the 3rd slot, and the other is in the first. Power it up, no display, and it (case speaker) is making a long beep (about 1 second), and about a 1.5 sec pause, then beeps a long beep again (repeats) I now try to boot with just one stick. Same thing. I look things over, and try some more. One of the times I turned it on it was beeping constantly (speaker constantly making sound) until I turned the PC off! What do these sounds mean? Nothing matched this in the Phoenix beep codes I looked up. So that's where I am now. Very productive....
Where do I begin? 
Biostar M7NCD Pro
Athlon XP 3000+
Powercolor Radeon 9600 Pro 128MB
Thermaltake PurePower 420W
60GB 7200RPM Maxtor
Here's the story. My brother's PC is having problems with a few..maybe just one game. After playing for 20 minutes or so, the game will exit back to Windows, sometimes with an error message (the one where ms asks you if you want to report it) and sometimes no error message. He was not using the latest video card drivers, so I downloaded the latest ATI had to offer and installed them. Now it seems almost EVERY game he tries to play is exiting back to Windows at some point...all except Halo. Then I tried Omega's latest offering...no improvement. I then thought it could be the RAM since he was using 2 differnt types (1x512MB PC2700 Crucial, 1x512MB PC3200 Ultra). Before I took 1 stick out, I relized that I had one stick in slot 1 and the other in 2. If I put one of them in the 3rd slot, dual channel is supposed to work.
So I moved one to the 3rd slot, and the other is in the first. Power it up, no display, and it (case speaker) is making a long beep (about 1 second), and about a 1.5 sec pause, then beeps a long beep again (repeats) I now try to boot with just one stick. Same thing. I look things over, and try some more. One of the times I turned it on it was beeping constantly (speaker constantly making sound) until I turned the PC off! What do these sounds mean? Nothing matched this in the Phoenix beep codes I looked up. So that's where I am now. Very productive....
Where do I begin? 






So I take out the crucial stick (slot 1) and turn it on. It appears to be back to normal. After posting a normal quick view of the temps, fan speeds, etc. the display goes black and just does nothing. The monitor has a signal. I turn it off, reset the CMOS with jumper, turn it back on, and there is no display and it is beeping again. Right now I am letting the battery set out incase the CMOS did not get cleared. Does this look like the mobo is going crazy or the memory?
It just sits there like this until I restart it 5 minutes later. Now it shows the screen that looks like I just reset the CMOS (says the settings have been reset to there defualts, I'm running a Athlon 1300, etc.) So I go into the bios settings by pressing Del, change the 100MHz CPU frequency to 166MHz, press enter, and whole screen goes completely blue. I restart the PC, no display, same beeping.