|Is this a new system, a newly built or upgraded system, or an old one?|
Has it ever worked?
Have you been having problems for a while?
Have you recently added or changed any hardware?
Have you tried removing one stick of memory, then switching them and tried the other one?
Have you tried clearing your CMOS, then resetting your BIOS to defaults, then manually checking your basic BIOS settings?
Have you tried booting to a CD with Memtest on it?
Please post back results and additional information on your hardware as well as the answers to the above.
You have to be a little bit crazy to keep you from going insane.