You need:
Now for the critical procedure.
BIOS issues in the HP Pro 3500 series often manifest as a black screen upon startup, continuous beeping, or the fans spinning at maximum speed with no display. These problems usually stem from: Interrupted firmware updates. Power surges during a boot sequence. Physical degradation of the CMOS chip. Step 1: Preparing the Recovery Environment hp pro 3500 series mt bios bin file fix
This is mandatory if the original failure was caused by an ME update gone wrong. You need: Now for the critical procedure
Since the standard HP BIOS recovery tools are not responding, we must overwrite the chip manually. Download the BIOS bin file below and follow the flashing steps... hp pro 3500 series mt bios bin file fix