Hi all. I have a old power pc G5 2.0 ghz dual with 2gb ram. It runs OS X 10.5.6. is my first mac, am 16 years old and love my mac, i bought for 600 three months ago, since a month or so all of a sudden it crashes for no reason. while using it it just freezes then if i live it for few minutes all the fans start working a making noise. i changed ram, HDD and restore it 3 times. i went to the apple store and they have no idea, if i want them to make a diagnosis the will charge me 85, so before i do that i would like to get some help from this forum. i did research but no one has this exact problem. Thanks for your help and time to read this.