Ok ,I resurrected this Mac recently and I know it's old etc but Apple did keynote videos back when this machine was released didn't they? so what's changed, surely this iMac should play simple web based video like that. It just stutters and stops ,stutters vid gets blocky then I get the beachball... Some video will play fine , some wont , especially on YT etc but on Apples own site I thought I've have no problems at all... what's going on? any help appreciated as always thanks muchly ~m Btw it is a 500MHz graphite G3 with 1Gb RAM, with recent fresh install of Tiger and fully upto date .