I have a power book g4 (13 inch screen) that will not boot-up. Can someone please try to help? Here's the problem. When I turn on the computer, I hear the chimes, I get the gray screen with the apple and swirling circle like usual, but once the screen turns blue and it says that it's "starting Mac OS X" it freezes here. It just sticks on this screen, or sometimes it moves past this screen to just a plain blue screen with a swirling circle sign which continues to endlessly swirl. Before this problem started, I noticed that the computer had been running slow on the internet, (for the past two days) loading pages slowly (Yahoo for example), and moving between running programs like word/internet/icaldenar/etc. When it locked-up while using these programs simultaneously, I restarted the computer, and this is when the problems started. My biggest concern is recovering files from my hard drive, as I do not currently have a backup. Some of the things I have already tried include, 1) Holding the shift key during the restart; didn't work. 2) Depressing the command + option + P + R keys, while waiting for the startup chimes three times and nothing. Does anyone have an idea of what is going on and how I can fix the problem? Any help would be appreciated.