Update May 2014: These issues are all fixed for me with updates of the OS. There is still the odd niggle with a crash when plugging in the display and the laptop restarting by itself when left in clamshell mode. But the black screen of death seems to be resolved.
Blank Thunderbolt Display with cursor, no MagSafe Power
Blank Thunderbolt Display, no MagSafe Power
No MagSafe Power
What I’ve to go through to get things working in clamshell mode
After Display Repair
The Night Before The Apple Store…