Attempting to recover from a failed BIOS flash. Right now machine has the power, charge and power button lights blinking. There is no backlight and CMOS checksum screen does display, but will not respond to F1 or F10 (also tested with external keyboard). Have made and inserted the HPDiagnostic USB, but never get the Bios recovery screen. Copied all three .FD files from HP driver page and renamed .bin to the root and Hewlett-Packard\Bios\current. I don't know what the bios naming structure should be, or if I need a .sig file, but the recovery screen does not show. Not sure where to go from here. Sold as Win7 has been upgraded to Win10. Any insight would be appreciated.