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lower your resolution to VGA and work your way up. Note that if you choose differnt geometry, the screen edges will hang off the ends of the monitor and you can not see then.. If you are out and can not see to change, you will have to boot up in safe mode (f8) and adjust down then reboot to normal.
A full service manual is available online---I will presume you tried to unplug it for a while and then power back to see if will reset itself.
This set has three hidden menus---one is the OPTION menu--in that menu with the Mitsubishi remote you can do a hard reset of the entire set= sets all back to factory except convergence adjustments which are stored in another area--cures all kinds of oddball issues.
I can give you a link to the manual and the page numbers for the OPTION menu.
Note: the other two hidden menus are Convergence and adjustment--do not go into adjustment menu as one wrong move and poof!
This problem is most likely caused by damage in the convergence output amp IC's; this model uses STK392-040. Fairly common for various fuses that protect the DC supplies for these amp IC's to open as well.
Its been a long time since I did it, but I believe you can adjust the green convergence grid by using the service menu. I found instructions on doing this over on the avsforum message board (years ago) so you might want to search there.