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The flashing between menus is probably owing to dirt in an arrow key, right-arrow or down-arrow perhaps (though this depends upon which way the flashing through menus is proceeding, and it could be the left- or up- -arrow button too.)
Or that arrow key (whichever direction it is) could be stuck down, in the On position.
The going away of the reviewed picture is almost certainly also owing to a stuck-down or dirty key on the camera.
This sounds like a rather basic repair. But it might not be one that you could do yourself, surprisingly enough.
Would you prefer to try to repair this yourself, or to be sure of a repair by sending it off, or taking it to, a repair center?