Intermittent RAM problem
I'm upgrading the RAM on a ASRock Prescott 800 board, from 256 to 512. Fisrt I put the 512 in slot 2 and it booted fine showing the new memory in the system applet. Sinch then it has not booted with both modules but would boot with either 512 or the 256. Then it stopped booting with the 512 and now it won't boot with any the 256 either, the 512 or both.
There's nothing on the screen while trying to boot, maybe the boot screen has been hidden?