Inspiron One 2205 will not turn back on.

The one I have is 2 1/2 yrs old and was almost 650.00 and from what I read online searching for answer's for this one I'm not the only person with one of these bad computer's. I called Dell to ask them if they would fix it free of charge, but they want to charge to fix it. I've tried quite a few things that I have read about online, and now I am replacing the power button, resetting the heat sink again, wiping the hard drive clean, updating the hard drive and the bios. I just hope one of these work. I will probably set it to stay on all the time also.