Powering up

So, has there been a comprehensive and conclusive study/explanation for how to handle things when the screen doesn’t light up and it doesn’t seem to power on? This happened one other time to me and as I was about to send it back for repairs it just started working again. It has been working fine for the last year or two and it just has happened again. I’m not nearly as panicky because I’ve been through it before, but doing more searches for this issue yields a bunch ‘this is how I cure hiccups’ sort of remedies, but no definitive process. It seems like this should have been clearly addressed at some point given how regularly this seems to crop up.

Any tips? I’ve searched the forums and have been trying different suggestions, but didn’t know if there’s been any official word from TE on how to handle this.