I have a problem with my imac (I have had it for over 3 years with no problems) about a month ago I installed OSX snow leopard and a new 1TB hard drive, no problems at all for the last month. Then on Sunday I switch it on and get the blue screen on death, I can see the mouse but thats as far as it will go, I left it for a it to see if it would sort itself out, it didnt, I tried re starting a couple times, nothing. I tried safe mode but it goes to the blue screen in that too. I then tried ctrl s followed by this (http://www.switchingtomac.com/tutorials/osx/how-to-resolve-the-leopard-blue-screen-of-death/) but havent had any success with that either. From what I have found online people are saying its a problem with something I could have installed but I havent installed anything the day before, the computer hadnt installed anything automatically either as I barely used it on the Saturday. Reformatting is not an option for me as I had a lot of important files which I hadnt had a chance to back up before it happened. Any help would be really appreciated as I am not sure where to go from here and I need to get at my work.