With the power off, press and hold the (or Windows + V ) keys.
Most modern HP desktops support "Crisis Recovery" (pressing Win + B keys at startup to force a BIOS reflash from a USB drive). Unfortunately, the HP Pro 3500 MT has a primitive implementation. If the primary boot block inside the 25-series SPI flash chip is damaged, the CPU never executes the code to check the USB port. hp pro 3500 series mt bios bin file fix
With the power off, press and hold the (or Windows + V ) keys.
Most modern HP desktops support "Crisis Recovery" (pressing Win + B keys at startup to force a BIOS reflash from a USB drive). Unfortunately, the HP Pro 3500 MT has a primitive implementation. If the primary boot block inside the 25-series SPI flash chip is damaged, the CPU never executes the code to check the USB port.