Trouble shutting down my computer. can anyone help?

i recently changed my screen to a LG/TV monitor and when i shutdown the computer, after few second it restarts by its self. I cannot longer shut it down as the cycle continues.
do i have to change the setting or i need to update my software?

Have you added any USB devices or connections along with the new monitor?
You can also try resetting the PRAM
http://support.apple.com/kb/HT1379
and resetting the SMU/PMU (power management)
http://support.apple.com/kb/HT1436 <- later models
<a class="jive-link-external-small" href="http://">http://support.apple.com/kb/HT1939 <- earlier models

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This could be due to an issue with the System Managment Controller. What you should do is try to reset the SMC. This will help reset the power flow of the computer back to the factory defaults in case something became corrupted throughout general usage. (Steps Below)
There could also be environmental variables that caused it, even a power surge that could have cooked something internally. Some power surges you may not even notice because they can be small, but just enough to damage a component. Do you use a surge protection power strip?
SMC Reset on iMac: ( http://support.apple.com/kb/ht3964 )
1- Unplug the power cord from the back of the computer.
2- Wait 15 seconds.
3- Plug the Power Cord back in
4- Wait 5 seconds.
5- Boot the computer.
Let it run for a bit (if possible) and see how long it will stay on.
If doing the SMC reset does not do the trick, then the problem will most likely be due to a Logic Board error and will unfortunately need to be diagnosed at the Genius bar.
Good luck MissLKMorgan! Let us know what happens.
- Captain

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Hello!
So I appear to be in the same boat as many of the folks on this board. My iBook (bought new in June 1996 - I am still on the original battery) will shut down after a few minutes if I don't have it plugged in even though the battery does not show any signs of being drained.
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Battery Information:
Battery Installed: Yes
First low level warning: No
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Remaining Capacity (mAh): 2430
Amperage (mA): 0
Voltage (mV): 16301
Cycle Count: 287
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AC Power:
System Sleep Timer (Minutes): 10
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 5
Dynamic Power Step: No
Reduce Processor Speed: No
Automatic Restart On Power Loss: Yes
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On LAN: Yes
Wake On Modem Ring: No
Display Sleep Uses Dim: Yes
Battery Power:
System Sleep Timer (Minutes): 0
Disk Sleep Timer (Minutes): 0
Display Sleep Timer (Minutes): 180
Dynamic Power Step: No
Reduce Processor Speed: No
Automatic Restart On Power Loss: Yes
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On Modem Ring: No
Display Sleep Uses Dim: Yes
Reduce Brightness: Yes
Battery Information:
Battery Installed: Yes
First low level warning: No
Full Charge Capacity (mAh): 1437
Remaining Capacity (mAh): 1436
Amperage (mA): 0
Voltage (mV): 16607
Cycle Count: 559
AC Charger Information:
AC Charger (Watts): 50
Connected: No
Charging: No
Hardware Configuration:
Clamshell Closed: No
UPS Installed: No
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Sandy
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http://support.apple.com/kb/HT1379
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Trouble shutting down my computer. can anyone help?

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