In 90% of these cases, the problem is not the motherboard, CPU, or RAM. It is a corrupt firmware chip. The solution is not to throw away the motherboard, but to perform a using an SPI flash programmer.
Fixing the BIOS on an HP Pro 3500 Series MT Go to product viewer dialog for this item. hp pro 3500 series mt bios bin file fix
The core of the fix lies in obtaining a "clean" .bin or .rom file. Official HP support websites provide BIOS updates in formats. Using utilities like Phoenixtool In 90% of these cases, the problem is
Press and hold the power button for 30–60 seconds to discharge internal electricity. In 90% of these cases