Using Windows XP Service Pack 3. When I try adding a 512MB DDR 400mhz RAM stick I get an error message ' scanning BIOS image in hardrive detects floppy Drive A Media Bios Auto recovering' and the computer then turns of. At the moment I have 3 sticks of 512mb RAM. But wnen I try to add another 512MB stick this bios auto recoveing message appears. The computer has 4 slots of 512mb ram available. Any help would be appreciated.