that sounds like MDT is having a problem… can you post some more details about the image you’re deploying? What was it captured from, what type of licensing, did you enter a key?
If you restart the computer, does it still have the black screen problem?
Did you supply the appropriate graphics drivers in the re-image? These would be supplied by adding them to the BFDriverRepository$ share, and setting the share path on the re-image page.
Can you remote into the machine to retrieve log files? They could be in a number of possible locations:
i had same issue, the problem you describe happening due Video card issue, by default when you install Windows XP under VMWare ESX he allocated 4Mb Video Ram, this not enough for Windows 7, while if you build new Windows 7 virtual machine VMWare allocated 8Mb of Video ram.
Conclusion:
While the virtual machine still Windows XP, shutdown the virtual machine and reconfigure the Video adapter from 4Mb to 16Mb.