Just reset the bios using the cmos jumper, or remove the board battery for a few seconds with the system turned off. Then replace the battery and power up. The post screen will tell you which f key to use to enter the bios; then set the boot order ex. cd>hardrive, memory voltage (set manually if needed) then save and exit. And stop trying to overclock if you don't know what you're doing. I stopped overclocking for better stability.