Project iMackenstein - Turning An Old iMac Into An "Apple" Monitor - YouTube
Mid-2007 iMac: Can I Connect a Second Monitor? | MacRumors Forums
Intel IMac As an External Monitor : 7 Steps - Instructables
Multiple screens on mid-2007 iMac with Ma… - Apple Community
How To Use an iMac as a Monitor for a PC
Amazon.com: QCEs Unidirectional USB C to Mini DisplayPort Cable, Support Only Mini DP Monitor(Not Thunderbolt 2 Display) 4K Video Output Cord 6.6Ft Compatible with USB-C MacBook Pro Mac Mini iMac to Mini
Turning an iMac into a half-priced Studio Display - 9to5Mac