my g5 imac won't go to sleep because the capacitors in it have leaked, periodically in its life cds have been trapped in it which wouldn't eject from the comman

my g5 imac won't go to sleep because the capacitors in it have leaked, periodically in its life cds have been trapped in it which wouldn't eject from the command line, i've had two old style keyboards that have broken completely because of small spillages on them, the mouse that came with the g5 was a worse at detecting movement than an older ms mouse.. i could go on. I bought it expecting engineering attention to detail, what i got was cosmetic attention to detail.