macbook pro stuck at two alternating schmatic images when turned on

The top message says, turn on your wireless keyboard, the bottom one says turn on you wireless mouse.

The take-away is that your keyboard and mouse devices are not seen at startup.

When hardware disappears, the first line of defense is an SMC Reset:

How to reset the SMC of your Mac - Apple Support

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HapJamTar wrote:

MacBook Pro stuck at two alternating schematic images when turned on - have images if that would help...

You are going to have to say more.

Take a picture with your iPhone and include it in your post, if it will help explain better the situation?

Is this purely aesthetic or disrupts your work flow in a practical manner?

HapJamTar wrote:

The computer turns on, what outline of apple on a black screen comes up, white horizontal bar shows things booting up, then, about 15 seconds along the white apple and line flash red for a split second, a few beats later the screen goes dark grey and alternates these two images - each image up for a few beats. - Thank you!!

https://discussions.apple.com/content/attachment/0a9611a4-d5bf-472b-a047-307e7d96e1a1

https://discussions.apple.com/content/attachment/fee6fea4-6a4b-4fdf-875e-a042b9a05f56

Besides Grant Bennet-Alder sage advice,

it would be meaningful to state:

what exact Mac /model /year /size /retina /TouchBar is this

or

what exact macOS you are currently running?