Imac Intel based shutting down

Hi,
I'm having problems with my imac.
it will turn off by it self after a few minutes of usage.
And after it turn of, it will take a long time until I can turn it back on.
I'm sure it a hardware issue because it happens even if I use windows with bootcamp.
Does anyone knows of something that I can do to fix it myself? because i can't have apple to check it, because I moved to Brazil, and I'm stuck in a country where when people see my iMac they will ask if it is a Monitor. and there's no one able to fix it around here.
It's kind of funny, bought an Mac because I was tired of dealing with PC's but it seams like it wasn't such a good choice, because if it was a desktop PC I could just take it apart and fix the problem.
At least, while it's not working is a nice way to make your living room beautiful.
Thanks for any help,
Roni

Hello and Welcome to Apple Discussions.
I'd advise you to try a SMC reset:
http://docs.info.apple.com/article.html?artnum=303446
Let us know how you get on.
mrtotes

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