I know what you mean brutha. I have less and less patience plus since I've done this for a living for the better part of 2 decades I can't stand working on PCs in general anymore lol. I got my fingers crossed on the PSU fixing the issue cuz if it aint that its going to be some oddball issue thats likely gonna take forever to troubleshoot.Sounds like a merry-go-round that you can't wait to get off of. I hate when you think you've got it figured out and it takes another four hours to fix. I used to enjoy trouble shooting computer problems, but the older I get the less patience I have. Probably because I just don't have the time to dedicate to it any more.
Good luck, hopefully this will be the last round.