Therealbigsteve

So I have a Thermatake Dr. Power II power supply tester. My PC has been failing to boot up lately and today I finally had time to open it up and do some testing. I changed the CMOS battery with the same results then I decided to test the power supply. It’ll pass on at first but will fail if I run a second test after the first one. This happens every time. Am I doing something wrong or is my power supply crapping out?