Help I have a power mac8.1 and it keeps shutting down at random times with no warning any ideas what to do to solving it?

Help please I have a power mac 8.0 mac osx 10.3.4. The problem is that it keeps shutting down on its own with no warning. this is totaly random with regards to the length of time. all I do know is the bottom right area of the mac feels warmer than the rest of it. does any one have a idea how to solve this.

Hello,
Have you blown the dust out lately?
One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for problem in Safe Mode...
PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive
Reboot, test again.
If it only does it in Regular Boot, then it could be some hardware problem like Video card, (Quartz is turned off in Safe Mode), or Airport, or some USB or Firewire device, or 3rd party add-on, Check System Preferences>Accounts>Login Items window to see if it or something relevant is listed.
Check the System Preferences>Other Row, for 3rd party Pref Panes.
Also look in these if they exist, some are invisible...
/private/var/run/StartupItems
/Library/StartupItems
/System/Library/StartupItems
/System/Library/LaunchDaemons
/Library/LaunchDaemons

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Help I have a power mac8.1 and it keeps shutting down at random times with no warning any ideas what to do to solving it?

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