OK one last thought you may need to check the voltage on the LPT port output. The newer PC use 3 volts which is too LOW for some of the BOBs to use reliably.
ALSO there MAY be a LPT port on the MB some newer PC have the port but you need to pluin a ribbon cable and a DB25 adapter to use it.
What OS are you running W2k,XP,vista,win7 ?? 32bit 64 bit??
(;-) TP