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Daniel, Mac Genius
Category: Mac
Satisfied Customers: 4770
Experience:  Apple certified on desktop and portable, help desk qualified. Have owned and used Macs since 1989.
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My imac 21.5 lcd is flickering and the colors are all wrong

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My imac 21.5 lcd is flickering and the colors are all wrong and blurred.
Thank you.
Hello, my name is Dan.
I will do my best to help you, the only stupid question is the unasked one.

The first thing to do in a sistuation like this is to reset the iMac.
Make sure you bookmark this page for easy return to let me know the results.
To reset the iMac doa restart from the Apple menu.
As soon as the screen turns balck press and hold thiese keys down together.

Option, Command, R and P.
Kepp them all pressed until the iMac cycles through three start ups (three chimes) then let go and let it finsh.
Usually this will fix that problem, it resets the PRAM.
Try that and then let me know how it works now.
Customer: replied 2 years ago.

Which key is 'option' key?

Thank you.

Here is a photo of the keys.

It is the key right next to the Command key on both sides of the space bar.
Doing both Command and Option on one side makes it easier than trying for either side.
It may take what seems a long time but do not let go until 4 chimes are heard.

That help?
Daniel and other Mac Specialists are ready to help you
Customer: replied 2 years ago.

Thank you.

I have followed your instructions and my imac seems to be ok now.

Thank you again.