Don't know if this applies to Toshibas, but certain HPs have a problem with the screens going all white. It is as you said, a dirty connection. The connection where the monitor plugs into the chassis oxidizes over time and must be cleaned with contact cleaner. HP should have sealed it at the factory, but then again, most have failed for other reasons by now.
It seems like a bad connection somewhere and I dont dare open my computer and try to fix it myself
Did you check the graphic drivers? can you go into the screen menu?
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