Output pin to activate something remote when turning on leds?

Questions
1

I’ll be adding 12v led strips to my house and was planning to use a PC power supply I have here. The nice part is that the PSU has 3.3, 5 and 12v all in the same box. But to get the 12v working, there needs to be a 5v signal sent to the PSU. I didn’t saw that anywhere so figured I’ll ask the question.

I could always recompile and add some lines in the code, but still would prefer to keep the original code.

Thx!!

2

Forget that, it’s already there, I just didn’t saw the option.
I added a NOT gate and got it working with the psu.