ACPI BIOS not compliant

I decided to have my IT department reformat and reinstall Win2000 on my CPx J650GT. It had been three years since I first got this computer. That was 11 days ago. All worked well until just this weekend, the computer went off but come right back on, it did this a few other times over the last four days. This morning I got 'the ACPI BIOS in this system is not fully compliant with the ACPI spec.' message. I do not have any idea what that means, but watched as the computer continued to start windows only to show the same window. I pressed the F7 key as it stated and now all my computer will do is start the memory test, and the window 2000 start page before I see a quick blue screen that I can not read before it returns to the boot memory page and goes all over again and again. I have just enough skill to think I can follow directions so I removed and resetted the memory cards as many messages regarding this same problem in forum boards. No help there. My IT department is on vacation and I have admitted defeat and bow to anyones help, including great descriptions.