Why does my mac pro gets extremly hot about 20 min or so that im on and freezes about a 1 hour that im on then i have to power off etc can u help me pls

why does my mac pro gets extrwhy does my mac pro gets extremly hot about 20 min or so that im on and freezes about a 1 hour that im on then i have to power off etc can u help me pls

You can find out what processes are loading your system by running Application Monitor (in Launchpad > Utilities if you're running Lion or Launchpad > Other under Mountain Lion). Select "All Processes". Sort the display by CPU% (click on the label of that column). What processes show over 10% CPU?
Also, when you click on the CPU button on the lower bar, what shows as your % idle? (Mine is showing about 98% just reading and posting here.)
If no process is causing the heat, you could have a hardware problem.

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