Just picked up an IBM Model 25 at an estate. Seems like it’s in pretty nice shape, looks super clean on the inside. But it isn’t doing much. The keyboard lights flash on power up, and the crt lights up but just displays blank. No beeps, no action from the floppy drive, just the fan spinning. Any ideas on what to start looking at first? I reseated all the connectors and the ram with no success.