Can't Overclock past 3.4 ghz

Ibreakthings

Reputable
Apr 6, 2014
572
0
5,060
My e8400 is at 3.4ghz and whenever I start my computer up with any ghz higher it starts with black screens turns off then back on on 3.4ghz. Then when I go to bios it says unable to start due to overclock. All my stuff is on Auto in bios.