I have an old iMac G5 without an Intel processor. The other day I heard a whistle sound coming out of it. The next day I turned it on, got the apple and a revolving pinwheel. The picture of the apple was a little broken up. After a minute the pinwheel stopped. Tried to boot of the leopard CD. Same thing happened. Looked inside for swollen capacitors. Did not find any. Does anyone have any ideas as to what can be wrong. Is it fixable?