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@joepep - Jose I’ve got some bad news here ;-{ When you tried opening your system without using the correct tools and technique you damaged the LCD displays fragile wiring. Sadly, this is not repairable. You’ll need to replace it with a new screen: iMac 21.5" Display LCD Assembly, Late 2012 / Late 2013 Here is the proper IFIXIT guide to follow: iMac Intel 21.5" EMC 2638 Display Replacement And the needed tools: iMac Opening WheelPlastic CardsiFixit Opening Picks set of 6 And you’ll need at least one set of adhesive strips: iMac Intel 21.5" (2012-2017) Adhesive Strips
