the issue lies with the CPU. go into the BIOS if possible and check to make sure all settings for the CPU are ok. If you ar unable to enter the BIOS then Remove the power cord and watch size button battery for 30 seconds and press the power button, replace the battery and start the system. this will reset the BIOS back to factory settings allowing you to enter them again.
the mem OK button should only be used if the system wont boot because of a bad ram setting. It sets the ram to a usable, bootable setting nothing else.
Also make sure all power cables are plugged in tightly.