As an aside what computer are you using ? and does it have an inbuilt parallel port or an add on card.?
Parallel is onboard and BOB fitted direct to port without cable.

What you said above in your post I did all this on the outset of completeing the BOB ie bought as a kit,checked for no dry joints and shorting of soldered joints and compoonent configuration.
I do have a fair bit of electronic knowledge as I repaired TV and Vids many moons ago.

The BOB seems to be finnicky in relation to the charge pump led coming on or not coming on when computer reboots,it could be paralllel port problems? but I've never had a problem printing from it and a the motors and drivers have been new I have to suspect the BOB at present,as I don't have another BOB I'm just looking for help on rectifying the problem.