Glad you got your problem fixed.
Do you mind posting the HP Part Number of the formatter for future's sake?
Thanks
Sorry for the long delay in reply .....
Yes, in case anybody wants to know, the HP part number for the formatter board is part number : Q5670-60014 - description is : Z3100PS Formatter.
My printer is a 44" Z3100PS GP - part number Q6660A
Thanks, John