Overclocking is a result of a misset bios code. There is speed control code in F7 (and FC6) which might cause this, but I don't know the name of the precise bit of software. What did you find when you pressed F7? Is the bios setup correctly? If not, most bios's have a "reset to default" capability which can be used to restore the basic setup and then you can customize it as needed, if you are familiar with BIOS setups. Otherwise, you may have misset one of the bus clocking bits or the cpu frequency. Was this system working and you just loaded F7 or is it a virgin system? Regards, Les H