Problems with nvram -c command

hello, I have a big problem.

I wrote in terminal "nvram -c" because I wanted to fix the fan velocity of my Mac Mini 3.1 (early 2009).

Now the problem is the light in front of the Mac Mini does´t work and also the fan works from the beginning.

Before I wrote in terminal I could configure the fan speed with fan control app, but now this program can't detect that exists a fan.

What can I do? is it possible to reverse the situation? if I change the battery inside the mac mini is possible to fix it?

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Have you tried booting up in Safe Mode?

What is your OS version and what is the app and version you where using here to control the fan?