So I unscrewed the back of the keyboard and took off the back and the plastic sheet thing. Then I put it back together and now it doesn't work. Help please. I'm using some GE Power Keyboard thing.

Isn't that the cause? Avoid this in the future.

Probably broke a lot of it.

Usually there is some contact rubber pressing the conducting paths of the plastic onto a small green circuit board. Maybe you haven't fit that exactly.

Or you actually ripped off a cable.

Not much else that could go wrong when the entire keyboard is failing.

Well I doubt it's gonna work, so I dug up my ten year old keyboard which was really dirty. I took off the keys to clean them, but now they have to dry. I'm typing without any keys on here. Good thing I've memorized where the keys are.

If you didn't use excessive force there really is no reason to assume you wrecked your keyboard. You are just lazy.