Help!  Can't Boot from Internal or External HD

My Powerbook is almost 4 years old (purchased Oct 05). Last October, right before my AppleCare warranty expired, I sent it in for repairs. Apple outdid itself. They replaced the display, the logic board, the optical drive, the battery and the charger. I was a very happy camper! In March 09, I accidentally dropped my PowerBook on its edge. The display was damaged -- black "ink spots" appeared on all corners and other places. Because I was not ready to buy a new computer, I kept using it. But the damage in the display slowly kept spreading throughout the screen.
About four weeks ago, the screen damage spread to about 2/3rds of the screen. I no longer could use it. So I borrowed an old LCD display and used the VGA adapter that came with the PowerBook to hook it up to the display. This was working great up until a couple of days ago, when I tried to boot up and, nothing. The computer began to go through the start up process but then it froze. Nothing showed up on the external display. But after shutting down and booting up several times, I was able to get it to boot up completely.
Today, I have been working all day to get the PowerBook to boot up. No luck. It just starts, you hear the "tada" and then nothing. I even tried several times to boot up from my external firewire HD by pressing the option key while starting. I have a Super Duper Clone on the external HD. Nothing, I could boot up. I am at my wits end! I intend on buying a new MacBook Pro, but I can't for about 2-3 more weeks. I don't know if I have internal damage in the PowerBook or if these are issues related to the recent OS update.
Anyone, please help right away!!
torinogiorgio

Part of the problem is that I can't see anything on my display, so I have to rely on the external LCD display. When I boot up by pressing the option key, I here "tada." The tiny part of the PowerBook's display I can see lights up dark gray, and then nothing else happens. Nothing at all on the external screen. The same thing happens if I boot up in Safety Mode (by pressing the Shift Key). I tried booting up with my external firewire HD, as well as using my TechTool Pro CD, and the same thing happens. It seems the boot up process just stops. Now my TechTool Pro CD is in my PowerBook and I can't get it out.
Help! What should I do?
torinogiorgio

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