Thinkpad does not respond - bizzare!
Based on your post/description that it was not the laptop that was dropped and that all the connections are snugly fitted to where they should be, the dropping of the moused caused the laptop to be dead, then it is likely that the +5VDC of the mouse cable has shorted to the ground wire. The short is reflected towards inside the motherboard of your laptop. This +5VDC is common to all the USB ports, PS2 ports, and many other parts of the laptop. The short would open up a fuse somewhere inside.
I can only surmise that the power supply is involved. You may need to check that the powersupply/AC adaptor (if present) is giving juice to your laptop with the use of a VOM, since as I understand it, simply plugging in your laptop to the mains would lit an indicator that ACpower is available.
Normally a surface mounted fuse is on the motherboard right after the jack where the AC adaptor plug comes in and right before a reverse protection diode.
If you are uncomfortable opening your unit and would not be in a position to do component level repair, you are probably better off seeking the services of a qualified service professional.
Hope this give you and idea. Good luck and kind regards. Read More At : ThinkPad X41 Tablet PC...