Can you get into the BIOS? Can you boot to a different CD, like a memtest ISO and check the memory? Then a HDD utility (like Seatools or whatever for what HDD is in it)? Start systematically ruling in/out hardware.
I can get to the BIOS and boot to a different CD. What do you recommend? I already reinstalled Windows. What hardware should I check, and can you suggest places to download these files?