hi all last week my iMac g5 iSight MA589LL 2118 went off and it wont come back on. nothing happens when you press the power button, and ive tried a different power lead.# ive tried resetting the smu (unplugging, leave for 10sec then plug back it with the power button pressed) but to no avail. ive opened it up and i cant see the led's? unless those 4 orange resistors are led's? are they are under the right speaker? anyway, im thinking the psu is faulty any help would be greatly appreciated. cheers.