I've never seen a PSU serial  cutoff, just the
Cube serial  itself.
  I've looked at all of my cubes (I have 4 here at the moment, 2 are
 Dimensions) but they all have been changed to the later type with
 floppy, hard drive and optical drive mounting holes.  I'm running all of
 mine dual heads without soundboxes, so it's never been an issue for me.
 James
 Jeffrey H. Ingber wrote:
  From what
I understand, there is a range of PSUs which fall in a certain 
set of serial numbers
which are incompatible with a ND color board.
Does anyone know which specific PSUs are capable of powering the ND
board correctly?
The only information I'm able to find is the serial #s of the compatible
systems themselves, not the serial #s of the PSU.
Can anyone provide some clarifican on this subject?
If your  customer has a NeXTcube with a serial number lower than
AAK0016370,  the system will only run with both monochrome display and a
color  display connected.  Should a customer want to stop using the
MegaPixel monochrome display and replace
 it with a NeXT Sound Box to use only a color display, the customer must
replace the power supply in the NeXTcube by purchasing the Power Supply
Upgrade Kit.