Thanks to all for quick response!
Just tried it with another new 21-22 pf cap which I checked with a precision multimeter (and with REL button)... but the board stopped working again... then so I decided to remove it again and use the board without it ! 
Anyway, I left undisturbed with Crossroads's opinion...
my concern was could damage the microprocessor or same fault but apparently work even though the cap values ??are very different.
thanks
Jorge