Osgeld, he has swapped out the logicboards. The video and sound issues go with them.

Well you will definitely have to recap at some point. These Macs are old and had some of the most notoriously bad caps of any of the compacts. So you are not out of the water. best to learn how now.

Sound is an easy fix, and the video may as well.

First thing I would do is stick one of them in the dishwasher and see if that makes any difference. I'd do the video one first as that's the biggest problem.

Also, on the sound, have you tried to plug in headphones to see if that is functional?