stuck on bios

[grass]

hey guys

do i just built a pc to sell for aa profit by getting second hand parts but i ran into some problems its not set to boot from the hard drive 

and windows 10 64 bit is on the hard drive so i would go onto the boot menu and change it but everytime i go there i press F9 or F12 cant remeber which one my keyboard works then when im in the boot menu in stops honestly im not sure if its the keyboard or the hardware and yes the keyboard works its aa corsair one and i game on it no problems 

the specs are as follows

gpu: asus gtx 660

cpu intel pentium clocked at 3:00GHz

motherboard: GA-P35-DS3