Ready for some quality time with my PC, to my unpleasant surprise I get an error message while booting that the BIOS settings were lost. After restoring it, and rebooting, GRUB returns an error. It seems that my (now primary) old HDD still had grub on the MBR. So I configured my newest disk as primary HDD and it booted again. It also only detects 3100 MB of RAM, while I have 6 GB installed. Maybe a setting to.
What's wrong here? CMOS battery dead?
update: 'Twas a BIOS setting: enabling "memory remap feature" (optimizing for 64-bit OS), the full 6 GB RAM is detected.