Computer will randomly sleep while trying to update

I bought this computer used around Christmas and everything seemed fine(even though I had not done many things with this computer) until I was using a downloaded free program off the internet (not wise now, I understand). Using this program my computer would randomly go to sleep. I could quickly wake it back up by hitting the spacebar but this seemed to happen too frequently to be good for the computer. I got rid of the program but have this sleeping problem updating Mac programs or similar things.
The last time I tried updating the computer after I completely reinstalled everything, the computer froze and I turned it off but had a hard time getting it back on. When I have to turn the computer off, turning it back on the fan gets really loud quickly and it shuts the computer right back off. I can eventually get it back on but this is not normal. Reading the discussion boards I heard of resetting the SMU and have already done this but it hasn't seemed to help. I just cannot seem to find out what I need to do. If anyone has a suggestion, please help!!

Welcome to Discussions - it sounds as if your power supply unit is failing. Make sure you back up all your data, I use SuperDuper!. Find the model of your iMac here iMac release dates, and once you determine that, check your serial number and see if you qualify for Apple'sRepair Extension Program or Rev B repair extension.
Please post back ,
Miriam

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