You always have to get estimates. The problem today is that they can charge for the trip to give the estimate. This sounds like a non-user serviceable area. That is you can try removing power for a few minutes and re-trying but that's unlikely (try anyway.)

The fact it does go away points to a board or part that has become heat sensitive but does not really nail it.

Just a few weeks ago the office snagged a 50 inch smart TV for under 350.