I've had several PS's die on me through the years. So, I finally bought a PS tester after the last one died. I bought a re-branded version of the CoolMax PS-228 type. I can find little to no information on how to use this type of tester. So, my story: 3 years into a 5 year warranty, I RMA'd a faulty PS. The 1st refurbished replacement [refurb#1] started and seemed to be OK, at first. Then, after shutting the PS off, the tester gave a strangled squawk while the PS shut down. It would not restart. I tried again the next morning. The PS still would not start. They sent me another refurbished PS [refurb#2]. It seemed to be OK. The tester made no noises on shutting down, but the PS would not restart after turning it off. I would have to wait 5 to 10 minutes before it would restart. Then, I tried refurb#1 again. It started up and seemed to be OK, but the tester still makes a variety of sounds when the PS is shut down and it will not restart without waiting 5 to 10 minutes, also. Q-1. What does it mean when the tester makes a single beep, or a strangled squawk, or a long drawn out warbling squeek after the PS is turned off? It has done all 3 and then some or none after shutting down refurb#1 . Q-2. An older spare PS looks OK when on the tester. It can be turned off and restarted immediately while on the tester. Refurb #1 and #2 can be restarted without the 5 to 10 minute wait if the tester is disconnected, then reconnected to the PS. Anyone have an explanation for what the reason for this is?