Quote Originally Posted by simplesolution
...the owner is an electrical engineer and tripped over the power cord on a job while in Fla. he had cracked the solder on the socket & I used a little silver solder to repair, the laptop worked fine for a week & a half before the screen started freezing.

Ouch that sucks. Then I would have to say it is very possible there is still some damage to the main board that could be the cause of the problem. One little broken electrical connection on the board is all it takes.