Sorry, no way. If his harddrive would be set up then he could configure the discdrive to read pc discs but now he can´t read pc floppies ... he really needs one the following two things :
1)an original Install disc
2)an Emergency Disc for the A3000 that gives access to a CDrom that needs to be installed. This Disc has to come from another A3000 user which has got OS3.9 and of course your friend needs to have the OS3.9 CD too !!!
