This is what worked for me. Plug a usb keyboard into the system. Keep tapping the f2 key until you get in to the system setup. arrow down to maintenance and servicetag. Enter the service tag for your system. You can only do this once so get it correct. then go to post behavior/ fn key emulation. enable the scroll lock key. then go to Save and exit the bios or system setup. reboot the system and tap the scroll lock key and x key simultaneously until the system starts to boot. Now the system should boot normally.