Black screen of death

On Friday March 17th, 2011, I was in the middle of preparing a paper to fax. The computer screen went blank. The fan on the computer continued to run, but I could not get the picture to show. I hook the monitor to my laptop, so I know the monitor is working well.
When I go to start the computer, it does not boot up. I can hear the fan running, but nothing else happens.
I have an Acer AM5640-U5401A, it's about 2 and a half years old. It does not get used very much being I have a laptop and it's upstairs in my home office.
please help
 
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