[notmytarga]

This is a good example of "percussive maintenance"

Worked all the time on the old tube TVs - before doing anything inside it was accepted practice to give a wack with a flat hand. I still apply this to most anything that quits working - it it wakes up you know you can hold off on a fix for the intermittent problem that is likely to be a loose connector - somewhere.

It is the reason that DIYers save so much money - we can accept that the problem may recur and we can try again later - a business wouldn't tolerate this so they are stuck replacing parts.