Old hp boards can do this; I've had two behave this way. One or both boards may have bad capacitors. Sometimes a board will post fine but windows will fail to load. And if you go to ebay, you'll see a vast majority of these old boards sold for parts only (they don't work anymore). Then you'll know it's best to get a newer board that uses ddr3. The hp ddr3 boards are too expensive; save your money and get a non hp board and get a new windows coa off craigslist if needed.