I have run umbrel before.
Pi died. Bought new hardware
new network cable
A HDD (confirmed working on Laptop)
New micro SD (the files tha I etched can be seen on windows)
Plug it all in. Can not see it on network in broser or with Angry IP.
Waited the appropriate 5 minutes plus for it to count fingers and toes.
Power lights up. Little red and green LED on Pi flash a bit.
The network connection flashes a bit to show it is working.
Do not know how to troubleshoot from here.