Okay,
Finaly got back to the form today. By changing the =0 to ="" in the earlier formula, that took care of the 01/00/00 result I was getting. This is the formula that works fine now.
=IF(AND('09May12'!G25="",'09May12'!F29="",'09May12'!F35=""),"", MAX('09May12'!G25,'09May12'!F29,'09May12'!F35))
Many Thanks to Skip, & GS for your patients & help on this one. Also thanks to Macropod for your input.
Chris