The screen is black and the rainbow wheel of death moves with the cursor

Help why won't it work?

A bad GPU? Screen? Connector cable between the two? It's difficult to say.
The best thing that you can do is to take your machine into your local Apple Store or AASP and have them diagnose the machine and get an estimate for repairing the machine, both of which should be free.
If it turns out that the problem is with the GPU or the screen, be ready for some sticker shock to repair your unit.
Good luck,
Clinton

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