IMAC Intel Core 2 Duo -- from Blue Screen to Shut Down -- Need Assistance

I have the iMac 20-inch Intel Core 2 Duo.
Was on the internet last night and the computer completely locked up, got he spinning pinwheel, waited for about 5 minutes and tried a force quit with no luck. I shut it down and then powered it back up and only got to the blue screen. Shut it down again, same problem. Let it sit for a couple of hours to see if it would fully boot but nothing. Searched a bit on the apple support site and went with the reccomendation of trying to start in safe mode, got to the grey apple screen, then it went black and shut down on its own and has done that every time since.
I have unplugged everything several times, reset the PRAM and still nothing.
I have been getting the spinning pinwheel off and on over the past few weeks but a force quit would usually clear the application. I have been experiencing problems accessing hotmail lately so I have been clearing the history and deleting cookies, this has been the only way I have been able to access hotmail. Don't know if that has anything to do with this or not.
Additionally the computer has been gradually getting slower over the past few months. Didn't really think much of it at the time.
My biggest concern is losing the data I have saved on the hard drive right now. Getting the computer to work again would be nice too as I only bought it about a year and a half ago.
Any assistance or info greatly appreciated.
Thanks

Take a look at these two articles: Startup issues http://support.apple.com/kb/TS1417
Gray screen at startup
http://support.apple.com/kb/TS2570

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