Need assistance from any techno-geeks out there, please. OK - my PC (emachines T1840, Celeron 1.8Ghz) died. I went to turn it on a week ago and nothing happened. The power supply fan was not working. I would like to get this running, and also retrieve our family photos on the hard drive. So I replaced the power supply - didn't work. Then I replaced the motherboard - didn't work. Next I replaced the processor - didn't work. Last I replaced the RAM - didn't work. At this point, all I get is a fast ticking sound in time with...