yup, running on 3.3V instead of the 5V required by the Datalux. In the words of the Datalux rep, "3.3 Volts only makes the unit think it's in standby."
You might want to look for a Belkin VGA Amp (labled as a monitor extender) shown here.
I got on nextag and got mine for $50 or so I believe.