My son gave me a Mac mini. It worked on a TV screen with remote Mac keyboard and the Mac mouse. However, he gave me a Mac monitor and when I tried to connect it was a no go. Both keyboard and mouse aren't recognized on the Mac monitor. I search the internet and it says "go tp system preferences, bluetooth etc" but if the keyboard and mouse aren't recognized how in the world can I go to system preferences? I've even gone back tot he TV screen and it doesn't work now. Batteries are all fresh and I'm stumped. Any suggestions?