I am trying to install QNX SDP 6.4 on a Dell Precision T3400 (with a SATA CDROM & a SATA DVD)
I am booting a CDROM (from iso:  qnxsdp-6.4.0-200810211530-nto.iso) and I get this message:

Hit ESC for .altboot....................................................

And then it halts (I have left it in this stage over-night so it isn't just working slowly).  I have tried booting 
repeatedly; hitting the ESC key and not hitting it.  No difference.

I have booted this CDROM successfully on other computers and I have booted other bootable CDROMs successfully on this 
Dell Precision.    Digging through the foundry I found that this symptom seems to indicate a problem with the secondary 
boot loader (as evinced by the string of dots), but have no clue what could be wrong.    Does anyone have any 
suggestions?