Greetings ,
Start by unplugging the device. Let it sit for about 2 minutes. Now press and hold the power button for about 30 seconds.
Next open the printer and look for any paper jams. This could be the corner or edge of a piece of paper. Sometimes using a flashlight can help.
Now reconnect to power an attempt to turn the device on again.
If this doesn't help, the printer will require service.
~Rick
Bay Area - CA
~R5 C (1.0.7.1) ~RF Trinity, ~RF 100 Macro, ~RF 100~400, ~RF 100~500, ~RF 200-800 +RF 1.4x TC, BG-R10, 430EX III-RT ~DxO PhotoLab Elite ~DaVinci Resolve ~ImageClass MF644Cdw/MF656Cdw ~Pixel 8 ~CarePaks Are Worth It
