This is unfortunate, as that points at a display problem which in my
experience with these laptops comes with very little chance of repair.
In
my opinion it is caused by overheating of graphics processor due to the
portege's relative small build. The fix would require dissasembly of
entire laptop and re-soldering of graphics processor. This takes a
technician using a microscope equipped station,( my father does this and makes over $40 an hour and I bet his company charges more. It is not cheaper than
some new laptop models available today. The non-expensive fix but risky,
would be to disassemble board and attempt to re-flow graphics processor
connections by heating with heat gun. When I attempted this I lost
entire display. My recommendation is to use external monitor if possible,
which may prove futile since issue with graphics will likely be visible
on that too. good luck
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