How can I use my iMac as external monitor for my laptop?
I have a 27" iMac mid-2011 that I want to use as an external monitor for my HP laptop. I bought an Apple Thunderbolt cable and StarTech TB3 to TB adapter to plug into my laptop Thunderbolt port. Sadly however many times I press Cmd - F2 on my iMac nothing happens. Any ideas?
iMac 27″, macOS 10.13