well first problem with my imac came at the release of 10.6.2. computer died after the update. went to the apple store to speak to a genius and he plugged in a external hard drive and update a file that got corrupted. fast forward three months. computer is up and running. going strong. go to sleep. i wake up to find a spinning circle ((not the beach ball)) on the desktop. i restarted it and it wouldnt boot. i bring it back to apple and the genius said my ram was bad. so i went to best buy and bought ram. i know i know i should have bought crucial but i just wanted to get my computer up and running. install the new ram, and boom. NOTHING!!! symptoms of the computer is that when i press the power button, i hear the fans go on real quick then down to a barely audible hum. like you have to really listen for it because its so faint. i have tried installing the OS again by following apples steps. ((disk in>hold c>disk utility>repair disk/erase disk. i erased the disk. restarted and it lets me choose the language. then it asks me to reinstall from backup. i just want to install the OS. any help?