Try a soft reset by holding down both the up and down volume control at the same time until it shuts down. If it then does not restart on its own, simply start it up again with the power button. This happens every once in a while to me too. You can also try just holding down on the power button until it shuts down.
Someone just posted in a thread where they indicated that the amount of ambient light could affect the bootup process. Try it again either with lesser or more intense lighting in the area. (Sheesh, it was just posted and I can't recall if more or less light helped!!!!!)
Great advice.....did the reset with the blackberry software, left it for about 3-4 hours...and the green switched to solid on. had to let it sit on the open screen as the new firmware was being installed or whatever...but after about 15 mins...bam, welcome screen. thanks so much for the helpful advice!!