OC standes for Overclocking. This message indicates that the BIOS is set to attempt to overclock the processor to a speed higher than its nominal speed. In your case, the processor obviously doesn't like it.
Go into the BIOS settings that control the processor clock speed and make sure that they are not set to any "turbo" or overclock values. Then, hopefully, you should be able to boot.
BTW, what type/speed is the processor?
 I'm not sure about this one - over to someone else.