Keyboard on 2006 macbook keyboard is not working properly. I'm just getting weird symbols when I type yet an external keyboard works fine. Is there something I can reset or replace? Please help!!

Is there a way to run a diagnostic at startup?

Your alt (aka opt or ⌥) key is stuck down. This seems to be quite common these days.
Try teasing it up with the corners of two credit cards or similar flexible, non-conducting tools.
If that doesn't work, the wafer switch underneath may be damaged, in which case it'll need to go in for service.

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