I am trying to repair my sisters old p1 system. I had the system running the other week for the 1st time in a couple of months. I had to reset the clock and dates when i started it up. I leaft it pluged in over the weekend. last week I then opened it up(without starting up prior and cleaned the inside of the computer with an air duster. Now I have no power at all. Fuses have been checked including psu's could the 3v battery prevent power up?