Lenovo x220 tablet pc with ubuntu 12.04 Shuts down and starts up unexpectedly

Hi
I bought a lenovo x220 tablet pc and installed ubuntu 12.04 with GNOME 3 a while ago.
It was working fine at first however recently:
1. the computer shutsdown unexpectedly, the shutdown dialog appears (the one that gives you the option of restart, cancel, or shutdown); I try to cancel it however the laptop would just power down (without going through the proper shutdown routine). Once it powers down it would try to reboot on its own but halfway during the reboot it would power down again.
2. At times when I do shutdown normally, I would just close the lid and the computer would start back up again, without my pressing the power button (just moving the monitor makes the computer startup)
In addition I dropped the computer on the battery side at one time and cracked the plastic casing a little. The above mentioned problems still exists when I use the laptop without the battery.
Does anyone have any suggestions on how to go about finding out what's wrong and how to fix it.
Thanks in advance for the help.

Hey mate,
sorry to here about that. Here may be a path to the clearing where a possible solution is waiting: Nowadays it is standard to let the pc (or more exactly the power manager of the OS) listen to the ACPI bus for messages like power button pressed and such things. If such a message surfaces and your power manager picks it up it is possible (if you have this configured as an action) that it shuts down you computer or restarts it. To eliminate this possibility you can try one of the following to things:
1. stop your power manager from working
2. get yourself superuser rights and use acpi_listen to listen to the acpi bus (if not working then install "acpid", shut down your power manager and start acpid as service)
3. open your system log (e.g. /var/log/messages) and search for things connected to your power manager or acpi
Please tell me if it worked! If not you could also post the content of your system log for analysis.
Using x230t (i5-3320M, 8GB RAM, 256GB SSD, 80GB mSata-SSD) and loving it!
"I may not own the world but I own my mind and therefore the world is at my feets." (me)

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