PC Boot Failure

[xkrazzy]

Hey, I just upgraded an old PC and I keep having boot problems. It all started when I flashed my motherboard and cleared the cmos. Now the computer will only boot right after resetting the cmos. If I restart it will just stay on a black screen and nothing happens, I can't get into bios or anything. Whenever I clear cmos it seems to work again, but after another restart I get the same problem. I've tried tweaking the bios and replacing the motherboard battery but still no luck. I've also recently noticed that whenever I boot I get a "cmos checksum error - defaults loaded". Anyone have any ideas?

System specs
motherboard: asus m2n32-sli deluxe bios:2207
cpu: amd phenom x4 9950 am2
memory: 4x 1gb ocz platinum xtc rev.2 pc2-6400 ddr2-800
hard drive: western digital caviar black 640gb
video card: evga gts 250 1gb

 

[darroll]

Did you turn off virus protect in your CMOS?

 

[xkrazzy]

I tried going back to bios 2001 and it worked fine, then I went onto 2205 and it worked fine, but when I tried 2207 again I get the same problem. So bios 2207 doesn't seem to work properly with my system.