/ PLEASE HELP ! ! ! /MP5.1 2010 Catalina/High Sierra to iMac 2010 High Sierra as a Monitor & Drives issue.

[Guest Rimux108]

Please HELP if you can,

 

Issue 1 is:

 

Starting both Macs simultaneously,

1. When MP boots on High Sierra iMac automatically enters Target Display Mode (TDM) and works as a Monitor.

2. When MP boots on Catalina, at the beginning of OS boot up, iMac display shows "Boot Screen" of MP5.1, and when OS booted, the view comes back to MP5.1 main Monitor and iMac's display turns black as he is entering TDM, but no further actions, just stays Black/Blank :-(

Connection between machines is...

 

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Source: MacRumors