My iMac has blue dots and won't load the booting screen.
The Keyboard won’t connect so what do I do? It won’t load.
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Sounds like you are trying to use a wireless keyboard.
This sounds like a GPU failure. To be sure boot up u8sing an external monitor or TV, use a wired keyboard so you can boot in Safe Mode and also be able to reset the NVRAM.
A lot of these cards can be fixed with a simple reflow of the GPU card.
Or you can replace it:
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Can you post a few pictures so we can see what you are seeing Adding images to an existing question
by Dan
@danj Okay I did.
by A_Qwerty_Bean
Where it has stopped is the point where it loads the GPU instructions.
by mayer
Yes, I have.
by A_Qwerty_Bean
@beanisverygood - Restart your system and press the Shift (⇧) key to enter into Safe Mode from a USB keyboard. Did that work? If it did then you do indeed have a bad dedicated GPU board.
Reference: Mac startup key combinations
by Dan