(I answered something similar in another thread, so I am just copying and pasting here)
Sounds like you have a short somewhere. There is no easy fix for something like this. You will need to take it to a service center for repair. If you keep trying to switch it on, eventually it will completely short out and you will have bigger problems. Take it to a center as soon as you can. The reason it probably comes back on when you push on that corner, is because it is probably shifting the main circuit board, and whatever is causing the short, is also being moved. So, the problem is definitely one of the diodes or resistors on the board. Unless you have the proper testing equipment, it's hard to determine which one it is!
Go to www.pasc.panasonic.com and there is a section called LOCATE A SERVICE TECHNICIAN - just enter your model #, and zip code, and a list of authorized techs in your area will be listed, along with phone #'s and addresses!
Good luck!
Mark.
May 2006