Computer wouldn't start up. Did diagnostics which pointed to bad power supply. Tried over and over, but kept shutting down after a few seconds or wouldn't start up at all.
Replaced the old power supply with the new and computer started right up...and ran for about 5 minutes! Restarted. Same results. Tried it over and over. Same results. Runs for 2 to 5 minutes, then shuts down. Removed new power supply and replaced it with the old (defective) power supply. Started right up and has run ever since (about 20 hours). I actually have 2 of these computers. I replaced the power supply on the other one last year with no complications. Your replacement and posted instructions worked perfectly.
Repair was very simple. I followed the instructions you provide on the web site. Can't explain what happened.