It sounds like two different problems on the two machines.
To eliminate issues on the first machine, run through the tests suggested in the link below. (Even if you’ve already done them once, do them again just to make sure. Sometimes a temporary outage with your service provider will cause the machine to hang up.)
Let support know the specific results of the tests at that link. It will help them to diagnose the issue.
Unfortunately, for the second machine, it sounds like it might be a power supply failure. That is not something you can fix, so for now, just unplug it and wait to hear from support. Sorry, but I can’t think of anything you can test for that one.