Computer Shuts Down After Removing All Screws and Putting Them Back

On the bottom of the laptop I removed most of the screws including the screws that allow you to remove the keyboard and most of the other screws too on the bottom. Why you may ask, no reason, just did it. I never had this problem ever until removed the screws and putting them back.
The computer only shuts down when the power cord is plugged in. Running off of the battery only I never have this problem.
Please note I have verified the following:
The computer only shuts down at random times only when the Power Cord is plugged into the computer and this never happened before until I removed the screws and put them back in.
I have tested with more than one thinkpad power cord to make sure
Tested with battery in the computer and removed from computer
My thought is maybe I missed putting in a screw on the bottom or maybe there is a ground screw I did not put in. Could my machine have an issue with not being grounded? I am not an electrician but who knows. Could there be something in the motherboard that a screw is missing in therer and not allowing grounding or other?
thanks

You should go get the Hardware Maintenance Manual for your unit and verify that it is properly assembled.
T60 2623-D7U, 3 GB Ram. Dual boot XP and Linux Mint.
T400 2765-T7U Windows 7
Registered Linux User #160145
FYI: I am not employed by Lenovo

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Computer Shuts Down After Removing All Screws and Putting Them Back

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