My Imac Has Blue Dots And Won T Load The Booting Screen Imac Intel 21 5 Emc 2428

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The Keyboard won’t connect so what do I do? It won’t load.

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: iMac Intel 21.5" EMC 2428 GPU Card Replacement