HELP ME! My computer is posessed! Very weird power problem!!!!

Question

I am using an iMac - first generation of intel-based iMacs - and I have a very weird powering-on and powering-off problem.
When I plug my iMac into the wall socket, it starts up on it's own. When I shut it down (using BOTH the apple menu OR the power button), it starts itself right back up. When I put it to sleep, it goes to sleep and then wakes up immediately. It does restart normally, though, so it seems that my iMac simply has a problem with being OFF!
Help meh! I'd like to save a trip to the Apple Store if I can help it!

Answer 1

Hello DrackerDesign
Welcome to Apple Discussions
{quote:}I am using an iMac - first generation of intel-based iMacs - and I have a very weird powering-on and powering-off problem.{quote}
Reset the SMC, as per > http://support.apple.com/kb/HT3964
+1. Shut down the computer.+
+2. Unplug the computer's power cord.+
+3. Press and hold the power button for 5 seconds.+
+4. Release the power button.+
+5. Attach the computers power cable.+
+6. Press the power button to turn on the computer.+
{quote:}When I plug my iMac into the wall socket, it starts up on it's own.{quote}
It will do that if the box *☐ Start automatically after a power failure* on the Energy Saver preference panel is checked.
{quote:}When I shut it down (using BOTH the apple menu OR the power button), it starts itself right back up. When I put it to sleep, it goes to sleep and then wakes up immediately. It does restart normally, though, so it seems that my iMac simply has a problem with being OFF!{quote}
If the SMC and Energy Saver Preference changes do not cure these problems, then you will need to seek service help.
Dennis