Hi everyone, This is my first thread here! Here is the issue I am having with my mac. I have a Quicksilver (OS X 10.5.8) that I got ine 2004. I am just now having problems with it. Around 4 months ago I noticed that the computer would turn off while in sleep mode. It happened every once in a while maybe 2 or 3 times a month. Last month though it was happening a lot. I would take out the power cord wait a few minutes and then plug it in again and it would work. A couple of days ago I had several tasks going on at the same time (was on-line, working on CS, updating my iPod and burning a dvd), for less than hour and the computer shuts off and I tried the above steps and it doesn't turn on anymore. Does it sound like the power supply is gone or something else? Please help! Thanks!