Touch bar not lighting up... UGH!

SpottedEagle wrote:

touch-bar / control strip delays illuminating after reboot and cold boot

If this is Intel Mac(?)—

Try resetting the SMC Reset the SMC of your Mac - Apple Support see the details.

Try resetting NVRAM/PRAM Reset NVRAM on your Mac - Apple Support

(get at least two-three rounds of the chimes when holding the NRAM Reset)

if this is an M1/M2 Mac(?) —

equivalent Shut down, close the lid 30 secs+ , reboot as normal.

If no resolve try SafeBoot How to use safe mode on your Mac - Apple Support to sort anomalies.

if no resolve it typically indicates a hardware issue:

Learn how to get your Mac fixed and how much it will cost. Mac Repair Service Mac Service & Repair - Apple Support

Get your Mac ready for service - Apple Support Get your Mac ready for service - Apple Support

Check your coverage

My Support - Official Apple Support