Here is the manual:
http://download.intel.com/support/motherboards/desktop/d845gebv2/sb/c1458401.pdf
I have spent quite a few hours perusing it while checking BIOS settings and restarting a ton of times. I promise, I put in a lot of time of trying stuff out and searching forums for answers before I posted. This just has me stumped. Actually, if you do your own search, you will find several posts about this problem. Those guys eventually figured it out, most of the time it was in the BIOS. I just can't find it. If you follow that link, BIOS settings begin around page 95. An important note, page 128, SDRAM frequency should show Auto, 266, and 333. Mine does not show 333 and I don't know why but think it may be part of (or a result of) the problem.
Here are specs from CPU-Z:
Name: Intel Pentium 4
Code Name: Northwood
Brand ID: 9
Package: Socket 478 mPGA
Technology: 0.13 um
Specification: Intel Pentium 4 CPU 2.60GHz
Core Speed: 1300 MHz
Multiplier: x13.0
Bus Speed: 100 MHz
Rated FSB: 400 MHz
So from what I have researched, bus speed should be at 133, FSB at 533, multiplier at 20, and this would bring CPU up to 2.6. Actually the processor is supposed to be a 2.66 with hyperthreading (not that I really understand what hyperthreading truly is).
It could be a compatability issue, but I thought everything was right. I inspected the CPU a few days ago when I put it in and everything looked good and straight. I will rip it down and check it out again if you think it might be part of the problem. I am wracking my brain here. Could it be a power issue??? I am running a 380W PS but its a pretty light computer, 1 hard drive, two CD drives, sound card, LAN card. Video is onboard. Please keep the suggestions coming and if you can check out the mobo spec sheet and BIOS info, maybe you can see something I am missing.