i have had my imac for almost 2 years--came from a pc. It seems to be slowing down. The spinning ball stays on the screen for a while. Shld i take it in to the mac store before my service contract is up? or what shld i do? i have read on this forum that you don't defrag a mac. I emptied my trash. does that really help? I read about OnyX 2.1.4 on this site. Shld i download it? what exactly does it do? i read the description, but...... I use vmfusionware for quicken. i don't have snow leopard.