Well I've been everywhere and no one seems to know for sure what is the proper solution for my problem. So I'll try here! I have a Biostar G965 Micro 775 (Chip: IG965-M7) and use one stick of G. Skill 2GB DDR2 800 Mhz. memory. Timings are 5-5-5-15. Voltage is at 1.95 Volts (memory says 1.8-1.9). It works great! Of course, I put the second stick of G. Skill memory in (yes, they are the EXACT same) and I cannot boot into Windows (64-bit Vista before, now same problem since upgrading to 64-bit Windows 7 RC). The bluescreen message says that the BIOS may not be fully ACPI compliant. What does that mean? I cannot upgrade the BIOS anymore, the last update was in October 2007. Why does this memory not work?
edit: Processor is an Intel Core 2 Duo E6600, which I usually overclock from 2.4 to 2.97 Ghz, but I drop down to normal for testing the 4 GBs. Graphics card is Nvidia Geforce 9800 GTX+.