Well you should make sure that no Pins are in fact bent.
Also check to make sure no virus/malware/etc on your comp.
Run Prime 95 to check CPU stability. 12 hrs minimum.
Make sure RAM timings and voltage is properly set in the BIOS.
Run Memtest to check RAM stability. 8 passes minimum.
CM PSU's aren't the best either, so could just be bad/dirty power getting to your comp.
You're also the second person today to pair a <6 phase power board (5 in your case) with an i5-750 and have issues. Technically the i5-750 is compatible with that board, but lots of people have been having issues due to the low phase power.