If you look around Silicon Valley, you see a lot of companies that have a culture similar to HP in its heydays, when the "HP Way" was still going strong. HP was one of the early companies to succeed in the Valley. I suspect other early companies in the Valley also had strong cultural influences on startups in the Valley. We know, for instance, that many startups emerge from individuals that worked for established companies, and what better way to transmit a culture than through individuals leaving one company and starting another.