I have a 2010 iMac that's painfully slow to use, but still could be put to good use as a monitor. I ordered a usb-c to mini display port cable so I could do it (I haven't received it yet). However, according to Apple's website, I can only use the iMac as a monitor with another mac using the Target Display Mode. There has to be a way I can use the iMac as a monitor for a Windows computer right? Any suggestions or helpful stories would be greatly appreciated.