Having problem with the f key shortcuts, need help

I connected my macbook to my hdtv, and used a wireless keyboard and put in new f commands, when I unconnected it, and tried to use the f keys on my macbook, they wouldn't work, I just get that ring noise, I tried to go to the settings and fix the f keys, but it wouldn't work, I pressed the default button and it didn't work the keys are still messed up, and theres no way to fix the f buttons, when I press the decrease or increase brightness buttons they won't do anything now, and I don't know how to fix this so they do work, can someone give me some help so I can fix this, thanks.

I connected my macbook to my hdtv, and used a wireless keyboard and put in new f commands, when I unconnected it, and tried to use the f keys on my macbook, they wouldn't work, I just get that ring noise, I tried to go to the settings and fix the f keys, but it wouldn't work, I pressed the default button and it didn't work the keys are still messed up, and theres no way to fix the f buttons, when I press the decrease or increase brightness buttons they won't do anything now, and I don't know how to fix this so they do work, can someone give me some help so I can fix this, thanks.

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