My brand new dv6910us started doing that. I tracked it down to my older external USB DVDRW drive. Unplugged that and it's back to a quick power up and boot.
My 1st issue - on start up I have long "hanging" time, almost 2 minutes, before desktop icons start appearing. My computer is clean, no real clutter, no spyware, used cc cleaner among others, etc. The only programs I have checked in msconfig are for zone alarm and avg. I did uncheck avg to see if faster....but no nope.