I've tried 510, 610, and 810 and none of them work properly. The 820 works

I have a 610 at my desk and it exits the PXE Policy check (says DONE) and
then hangs. Hard. You have to power off.

I have set up a 10.1 server but this didn't help. I have looked for BIOS
updates and there are none for this lattitude. Can anybody else verify this