Pressing the power button does nothing, was working fine yesterday. I had heard from a lot of people that I may just need to replace the logic board battery. Anyone else have some tips? My G5 has been unplugged almost a full day now (I am at work, computer at home), should I try pulling out the battery, then replacing it, and powering on? How about putting in a new one? Can I just get the right battery from Radio Shack?