You will likely have to reset the BIOS values to default in order to get back into the BIOS. I'd presume that this is a desktop system since there isn't much room for custom BIOS settings in most laptops.
So, unplug the system from the wall and open the case.
Ground yourself on the metal of the case with one hand and either:
1) Remove the CMOS battery (about the size of a nickel) and leave it out for 30 minutes.
2) Use the CMOS jumper to reset the BIOS to default values.
After this, put it all back together, plug it in, and boot up. If this doesn't fix it, then I'd suggest a RAM test (such as this free one: http://www.memtest86.com/
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