Chosen Solution

I have 2012 Mac Mini, 2.3 GHz Intel core i7 and 4 GB memory. I have a problem with the Mac wireless keyboard connecting to the Mac mini. I cant get it to connect! I did change the batteries in keyboard. Bluetooth icon does not show wireless keyboard connect to this mac mini. I borrowed my friend’s iMac wireless keyboard (he bought new 2017 last spring) and it still not working on my Mac mini. Cause this mac mini’s rifi or sma bad? What wrong on mini ? Keyboard not good? Appreciate any help. Dusty

Run a good “Paid For” anti-virus on it, then give it a try.