|Try removing the CMOS battery from the motherboard and leave it off for at least 10 minutes. Then put it back. make sure you put the battery back the same way up as it was ( the '+' symbol should be face-up).|
Information: the CMOS battery is usually a little, silver-coloured coin-shaped battery.
Disconnect PC power cable and touch the bare metal chassis to remove static electricity from your body before touching any motherboard components!
Re-assemble the PC and re-connect power cable.
On power-up, press the correct key to enter BIOS Setup.
Select "Load BIOS defaults"
Save & exit the BIOS Setup.
Your PC will reboot and the drive lock should no longer be active.