SAN FRANCISCO (AP) — Hewlett-Packard Co. used to be known as a place where innovative thinkers flocked to work on great ideas that opened new frontiers in technology. These days, HP is looking behind the times. Coming off a five-year stretch of miscalculations, HP is in such desperate need of a reboot that many investors have written off its chances of a comeback. Consider this: Since Apple Inc. shifted the direction of computing with the release of the iPhone in June 2007, HP’s market value has plunged by 60 percent to $35 billion. During that time, HP has spent more …