What a ridiculouse sugestion,bending/squeezing,highly sophisticated modern technology,so i just squeezed my memory stick pro duo,ha ha,unbelievably it worked.technical instructions as follows,squeeze between thumb & forefinger sides of stick & then the front & rear together & it worked for me,the stick now works fine,strangely though search as i tried,i could not find this solution in my cybershot manual lol.

Sorry meant to say thanks Alex,Was about to send stick back as faulty.