If it were me I would just keep looking.

When buying a camera that is already in good shape, where everything works when you buy it, you know that everything is in good condition at the time of purchase.

When buying a camera that is already not working correctly, you are assuming that everything is in good shape and just needs an adjustment. You are probably right, but you could be wrong.

A good one at the right price will show up eventually. Besides, this is allowing you an opportunity to learn those things that should be avoided.