Voltage offset problems

[like_21_ninjas]

Hi I decided to overclock my amd cpu and then used negative voltage offset to keep temps low whilst idling. Initially i used offset of -0.05V and everything worked fine and temps were lower as well. However, when I rebooted the pc, I would hear the POST beep, but the PC would just shut down again and just keep rebooting. Luckily I could get into the BIOS and so I lowered the voltage offset (to - 0.04V) and then the PC booted. However, the next time I rebooted, again the same problem occurred so I lowered all the way to -0.02V. Again after reboot the same problem occurred so this time I increased voltage offset in the BIOS to -0.05V and the PC booted fine. I have no idea how to fix this apart from setting offset voltage to auto which seems to fix the problem but its not what I want. Any help would be greatly appreciated.