The idea behind baking the card is to get the solder to reset. This is assuming that the card has been heating up enough during daily use to eventually melt away a connection.
This really isn't a great idea, if you were going to try this, you should use a heat gun to properly heat the solder up, but then you can do even more damage unless you sufficiently isolate the issue to a small area on the board.
Personally I bet it is a video memory issue, in which case the card is pretty much FUBAR.
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