Hi, my PC mounts Crucial 8 GB 2400 MHz memories. I've tested them and no one problem coming up.
Greetings,
I'd test with a different stick of RAM.
If you have re-flashed the BIOS multiple times, the chances of a bad flash are low unless your source file is corrupt.
Power and MB battery are fine, otherwise you'd lose date and time as well as settings.
Even if you aren't over clocking, memory that struggles to meet BIOS specs could cause this type of behavior. I think ElectroStingz is on the right track with memory. You can try manual settings, or test with another stick of RAM to confirm.