Why is my 2011 imac getting really hot after being repaired twice?

My 27in 2011 Lion Imac is being wierd. I have always noticed that the Hard drive or fan would not turn off when put to sleep. Even when I would get up in the morning, it would still be on. The first time we got it repaired was when the computer would just crash, and eventually not even start up! We went to a local Mac dealer who also did repairs. They said that the circut board was totally burn out, and that they had replaced the power supply. We got home, and all was well untill two days later it just froze. We restarted it and kept on pushing but soon it was either freezing or a gray screen would roll down and say it has to be restarted. It also got so hot, that we could smell something burning. So we brought it back. This time they said that the directory was totally corrupted! So today we brought it home and all seems to be fine, although it seems to still be getting really hot after only an hour of use. When I listen cloesly to the machine it sounds like an electrical buzz. The buzz did fluxuate with the computer doing different tasks, so it could just be the preccessor or something. This is getting very annoying.
Are there any experts or people that have had similar problems and what they did to fix them? Thanks...
I have never had a Mac act this way.

If your iMac is still under AppleCare warranty, backup everything on your iMac, bring it back either to Apple or the repair center and kindly, but very, very strongly ask for a replacement iMac.
Your iMac has just got too many issues and components that failed.
Under AppleCare, you can ask for a one-time complete replacement.

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Why is my 2011 imac getting really hot after being repaired twice?

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