peetee,

That is weird its not booting up?  Do you get the gui?  If yes you can launch terminal and try and debug your network config but no idea why that should have changed by swapping m2 drives.  I guess make sure its seated firmly in the m2 slot?  Are you sure network cable connection is good as well?  Yeah obvious things but who knows.

I did switch my miner to eco mode until it was synced to keep temps down - i forgot to mention that.

  Mine booted, got to the gui, I went to Settings, in the bottom lower right under Extra Settings I selected the Format Node NVME SSD and I was off and running - took a few days to finish synching.