having problems with pt10-HD3

[STRstudio]

Had to get a new used ProMac 09 4-core - 8g ram(for now), my 08 ProMac 8 core mountain lion had problems. I was able to pull the hard drive out of my old mac and put it in the new mac but now having problems. First, it sees 8 cores in the Pt playback setting and only has 4 cores in the mac? Then it played fine but when I brought up a session I was working on from the old mac and nothing was coming out of the system, no meters showing signal but pink noise was coming from some verb plugins on the aux and the meters were peaking. I rebooted and then it played fine? Then I checked out another song and did it again? Could this new mac have a problem too? Or has anyone heard of this and how to fix?

This is the first time I had to post to this. In my 16 years of using PtHD started with Pt6 HD3 PCI

I have 2-192 w 32 inputs and 16 outs, 3 PCIe cards, UA satellite plugins, control 24, PT 10.3.10, I'm happy with TDM still