Apple and PC's, Both Given Up for Dead, Are Rising Anew
Apple Computer Inc has had remarkable resurrection, after being all but given up for dead just few years ago; company recently exceeded analysts' estimates in reporting its sixth consecutive profitable quarter; secret to Steven P Jobs's successful return to Apple is small manufacturing and design team and highly disciplined engineering process put in place in last two years by Jon Rubinstein, who leads manufacturing team; that team is responsible for popular iMac machines Apple began shipping last August, for critically acclaimed G3 desktop and portable machines that updated Apple's moribund Macintosh and Powerbook lines, and for new low-priced portable to be introduced in next few months; some in industry wonder whether introductions of two successful computers necessarily mean Apple can sustain its comeback in highly volatile PC industry; photo; graph (M)

