IMac keeps asking to be restarted

Question

My iMac keeps asking me to re-power up. After I do this, the screen comes back with the same request to re-power (restart) the computer.
Any advise on simple trouble shooting I can do at home.
Thanks.

Answer 1

Welcome to Discussions - a couple of things to try are resetting the PRAM, also the SMU:
1. Turn off the computer by choosing Shut Down from the Apple menu, or by holding the power button until the computer turns off.
2. Unplug all cables from the computer, including the power cord.
3. Wait 10 seconds.
4. Plug in the power cord while simultaneously pressing and holding the power button on the back of the computer.
5. Let go of the power button.
6. Press the power button once more to start up your iMac.
You can also run Disk Utility to check your drive:
1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk.
And last, but not least, use the Apple Hardware Test on your install disc.
Do let us know what you find out,