CPU randomly spiking in temp, and overheating
I've had an i5-750 for about 3 months with after market cooling and OC to 3.5ghz. It has been completely fine, idles at 30, stress test at 60, and on avg video games at 40-50.
Last night my computer just shut off, obviously over heating. So I started checking my temps again and it still idles at 30-35 but it just randomly spikes up to 50 (and during the few seconds spike the computer is insanely slow), no weird processes running, just the basics. So...my question is, where to begin troubleshooting? Unless someone knows exactly whats wrong?