With the computer off, press and hold the Windows key + B .
A corrupted BIOS on the HP Pro 3500 Series MT can cause your system to fail during boot, often showing a blank screen, blinking Caps/Num Lock lights, or continuous fan spinning. While a standard update uses an executable installer, a "dead" system often requires a manual fix using a file and an external programmer. HP Support Community Common Recovery Symptoms Power but no display : The internal fan spins, but the screen remains black. Blink/Beep Codes hp pro 3500 series mt bios bin file fix