How to remove the sun logo from the iMac screen

As others above mention, it’s not clear what you’re asking about...

Here are the usual startup displays: If your Mac doesn't start up all the way - Apple Support

Here is how to change a screen background image: Change the desktop picture (background) on your Mac – Apple Support

Here’s the screen brightness: Change your Mac display’s brightness - Apple Support

Here’s the screen brightness icon, usually with a horizontal bar beneath, showing relative brightness.

It sounds like the display brightness icon is stuck on your screen? You can try to fix it by resetting the NVRAM for your computer:

• Restart the computer holding down the command - option/alt - P - R keys before the black screen appears.
• Continue to hold until you hear the startup chime for the second time.

SG_Tom Said:

"How to remove the sun logo from the iMac screen"

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Please clarify:

What is "the sun logo"?

Providing a Photo:

Can you please take a photo of your screen (using your camera), and attach it to a reply post. Proving a photo of this would most certainly allow others to see this firsthand from your perspective.