Sometimes my iMac starts with white lettering across the screen on a black ground and after switching off for a few seconds starts on ok ! Any ideas

Sometimes my iMac starts up with white lettering acrossthe screen on a black background - when it's switched off for a few seconds it starts up ok. Can anyone tell me why this happens ?

I have read on here that a PRAM reset can cure this problem:
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

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