Hi folks looking for a bit of help here, My mates just got himself a g5 mac of ebay and brang it to me to help him get it working. Im no mac expert just use them at work and have a mac book, but no more than him on the subject so trying to help! In the product description of the item it said it just needed a start up disk to work, i have no start up disk for it so cant test this right now. Is this common with macs? im sure my book came working right away with out this trouble? when i press the power button the led lights up and makes 'the mac on noise' and apears to be working, the display doesnt do anything and it sits there sounding on but doing nothing. is it possible that the machine has no os installed? has my mate been ripped off and paid for a broken mac? any help would be ideal, as im out of my depth here, ta Edit: the monitors a Apple Cinema Display.