edited the WIKI to attach the majority of this info .. (cool beans! )
Other realated problem -- Thunderbolt connector may have been damaged / deformed and this makes a bad connection when plugged into a computer.
One suggestion to troubleshoot: 1) disconnect the TBD thunderbolt connection from the host computer. 2) Use a known good standard Thunderbolt cable and connect one end to the host computer, and the other to the single Thunderbolt port on the back of the display (next to the FW800 and USB ports). If the display works as expected, replace the attached TBD cable. (OEM A1407 Thunderbolt Display All-In-One Cable For Apple 27" 922-9941 Assembly )
Would like to see a continuation of what it takes to replace the Thunderbolt cable that is attached to the back of the display