It will not detect a Thunderbolt signal. The laptop will charge still through the display but the laptop will not detect anything connected at the Thunderbolt bolt. It has a some scratches on the casing and stand. Not dents of major damage! The glass screen is in good condition but has one scratch towards the bottom left area.
The LCD screen worked and look great before it stopped working. The only other damage is the Thunderbolt cable was highly worn. I coated it with white liquid electrical tape to repair it.
My guess is the Thunderbolt cable finally shorted out. Possibly replacing that cable would fix this. For newer USB-C port Mac laptops, you would need a Thunderbolt 3 to Thunderbolt 2 adapter. Then you would need a USB-C MagSafe adapter for power, if you want to charge/power your laptop through the display. The item "Apple 27 Thunderbolt Monitor A1407 LCD Widescreen 2560 x 1440 Display AS-IS" is in sale since Saturday, February 6, 2021.
This item is in the category "Computers/Tablets & Networking\Monitors, Projectors & Accs\Monitors". The seller is "locknkey2003" and is located in Topeka, Kansas.This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, Sweden, South Korea, Taiwan, Belgium, France, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Montserrat, Turks and caicos islands, Barbados, Bermuda, Brunei darussalam, Bolivia, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Oman, Pakistan, Paraguay, Reunion, Uruguay.