this is probably a problem unique to me! I have a 20" imac 2.4 alu. it came with tiger but I upgraded to leopard when it came out but i have totally lost the upgrade disks (yes, i know, very poor show but we have just had the builders in and i think it went in a crate to the tip by mistake). I then let my 4-year-old onto my imac..........oops! i created a user account for him with locks etc. but one day about 3 months ago I still managed to hear a 'dadeeeee' from the computer desk and the mac was in the middle of a major shutdown. To his credit, he had worked out how to get into iphoto and watch video clips all on his own and been doing so for at least 6 months previously. after 20 mins it rebooted but without his user account. ever since it takes 10 mins from shutdown to get to the user login and then another 5 to actually login. switch user now takes 10 mins. but at least on one user sleep/wake is as quick as usual. still awake? i am pinning my hopes on an upgrade to SL fixing this. Any wizards out there know if i am on the right track or peeing into the wind? applecare has long expired ta.