iMac Pro screen goes blank at start up

There is no 2015 model of Mac Pro 42 Lb silver tower or dark cylinder.

The iMac Pro was first issued in 2015..

is this perhaps a 2015 MacBook Pro, with 13-in or 15-in built-in display?

Click 👉🏼 Mac Startup Options.

Click 👉🏼 Mac Startup Methods.

What model Mac Pro or iMac Pro by year?

What version of MacOS was running?

can you get a picture if you hold command R to invoke Recovery?