How can I permanently disable the "fn" key?

Hi. My subject says it all. How can I permanently disable the "fn" key?
At first I thought I had a virus or something because when I typed only weird symbols came out. Then I reset the computer. Then I couldn't even log in. I tried Time Machine etc.
Then I realized that the "fn" key wasn't working right. It seems to be working backwards. It acts like it's being pushed when it's not, and when I do push it it acts like it's not being used.
So it's kind of a simple problem but it's really annoying.
Is there a way I can just disable it permanently? Even physical force if necessary. I tried to break it but it wouldn't break. I don't really use the key anyway so it doesn't really matter. I don't want to pay a bunch of money to replace a key I don't even use.
Thanks. I hope someone knows.

That's the best answer. Yeah usually if you press "fn" or "option" you can get it to work for awhile.
Yeah I have considered some kind of external keyboard also. It will make a laptop less laptopish. But it could do the job for awhile.
It's sad because I don't even care about the "fn" or "option" keys.
But anyway it's not catastrophic at least.
And yeah maybe we can get a new computer later or something. I like mine though. It's customized and is how I like it right now.
Anyway thanks for the reply.

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How can I permanently disable the "fn" key?

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