MBP powering off unexpectedly when running on mains power

I have an early 2006 MBP 15". For the past few weeks it has been powering off unexpectedly while running on mains power. If I take the battery out and continue on mains power there is no problem.
I replaced the battery with a new one but I still have the same problem with running on mains power, battery installed and powering off unexpectedly. This happens about 5 minutes after powering up.
Has anyone got any ideas what might be causing this?
Thanks.

Hello J.C Thanks for your response. I tried resetting the SMC but the problem still occurred. With some further investigation I have narrowed it down to a USB accessory. Either mouse, keyboard or iPhone docking station.
Seems weird that the problem didn't occur when the battery was taken out but still running on mains power.

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Does anyone know what it could be? I have searched in the forum but the answers hasn't been satisfying. I find it weird that I have to use the keyboard or the track pad to keep going.

Not sure what the cause is but you can try resetting the SMC.
Intel-based Macs: Resetting the System Management Controller (SMC)
See:
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Hi,
T410 laptop turns off abruptly when running any application. I contacted the technical support, first they suggested me to run some diagnostics for hard disk which failed and so they sent me a new hard disk. Even then I faced the same problem. Again I contacted them and they told that they will change the system board. Today I received the laptop with new system board/updated BIOS.
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type: 2516 -CTO
S/N: xxxxxxx 10/03
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Moderator Note; s/n edited for members own protection

Hi and welcome to the forum!
Tell us something more about your system, like installed memory size, processor speed, graphics card make and size, HDD size and so forth. Because yours is CTO model hence it's not possible to figure out these things without your telling us about them.
I'm not very expert but I would say it's probably the RAM since system board and HDD have already been replaced or possibly you have got a lemon. But try following suggestions first.
Do you get any sort of error message or Bluescreen? does Event Viewer report something unusual? Event Viewer can be opened by typing it's name in the search field in Windows 7. If you get Bluecreen you can view it via this program:- http://www.nirsoft.net/utils/blue_screen_view.html and let us know what it says.
Also, make a bootable CD of mem86 and run the test on your RAM, mem86 can be downloaded free from:- http://www.memtest86.com/
Lastly, you can burn LiveCD of any Linux distro and boot from it, if applications work fine in Linux environment then probably it's some software problem your thinkpad is having, re-imaging the system to factory state would be great initiative in that case.
Keep us posted!
Maliha (I don't work for lenovo)
ThinkPads:- T400[Win 7], T60[Win 7], IBM 240[Win XP]
IdeaPad: U350
Apple:- Macbook Air [Snow Leopard]
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Did you notice this issue from first day of purchase?
Theoretically it could be possible that your battery starts to malfunction
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MBP powering off unexpectedly when running on mains power

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