Similar problem as yours are often repeated here on the forum. Search and google if you need to just to cover all bases.
I am not sure about all the details of my computer, but it just started not turning on. When I push the power button the light comes on briefly and than won't turn on. I used another power supply thinking that I might need to replace that, no luck it did the same thing. The only other thing I think is wrong is the motherboard is bad. Is there a way I can either check it myself or is there something else I could do? I only bought it last year and I would hate to loss the stuff on my drive. Fortunately I did back up my other drive (D: and E
but didn't get the C: drive backed up. Since I did want to reinstall my windows 7 I was going to do that anyways but I hadn't gotten as far as to back up that data. Is there a way to do that if nothing else goes right for me?

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