I brought home an old imac last night that had been sitting at work for over 2 years. It powered up fine, then my daugter turned it on...and off...and on...and off..etc. I finally got a hold of it and looked at a few things, turned it off and was planning to move it into another room so that I could hook it up to my net work and play (I know nothing about macs). When I plugged it back in and tried to turn it on...nothing. It won't power up. I have tried several outlets, including the outlet that worked before and I tried different power cords but nothing works. Any ideas???