Bad CPU or bad PSU?

[Strange-Current]

I put my new build together and it was working a couple days before the DRAM light showed on the motherboard and it refused to POST. I purchased a lot of parts from Amazon so I easily replaced my motherboard and memory, and hooked up an old PSU which I know is good. I got the same error, so I changed out the CPU as well and the error was gone. So everything appears to be working well with an old PSU and all new parts. Did I just have a bad CPU, and I can connect my new PSU? Or, did my PSU fry out my CPU? The PSU is a new Seasonic platinum 600 watt so it should be of good quality so idk. If I take the PSU in to a local shop can they test it and tell me? Could it test out good but fluctuate later down the road?

 

Btw I wasn't stressing the components system was just idling.