Display turns off and keyboard and sound disabled when bumped?

I have a Powerbook G4 12". My computer works great when it is running, but if i bump it from the bottom, my screen turns off, sound and keyboard stop working as well, but can still hear the fan running. I hold the power button until it shuts down, and then restart it and everything is fine, until i bump it again.
Another problem that might be related is that sometimes when i open up my computer to wake is from sleep mode, the computer turns on, but the screen and all functions do not work. An this is even if i do not bump it.
Thanks for any help!
Michael

My G4 Power had no display so I plugged it into an external monitor. This gave me a display but then I found the keyboard and trackpad were not working. I used an external keyboard and USB mouse to start System Profiler. This told me that the Powerbook was operating in clamshell mode. The most likely reason is the reed switch that detects when the display is closed is jammed. It is no easy task to replace this switch: http://tinyurl.com/4uourh
I would be interested in any less subtle ways to fix the problem (eg waving a strong magnet near it)?

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