If you have not already done so, I would recommend replacing the coin cell battery on the CPU board and then shorting the reset pins on this board.? Not sure if this will solve your problem, but it did help me with a booting problem on this instrument and it's something that's easy to try.? Also double check the health of your hard drive and that it is properly connected.? You may want to also consider cloning the hard drive to a modern SSD drive to speed up the boot process.
