"Reading noises" getting worse over time.

I don't watch a lot of t.v. I don't have one, I love dvd movies though and usually end up watching a few on my laptop each day. I need to know if the problems I've been having are something I can fix or if my superdrive is dying.
I've read all the posts where people say their dvd player is making "wherring" noises and people say that its the dual layers of new dvds, or the computer reading through copywrite protections, or the dvd being scratched ever so slightly.
I get the wherring noise when I first put in a dvd, but after the movie gets going the sound is like (don't laugh to much) a dying digital frog is living in my superdrive. When it happens the noise lasts between .5 seconds and 2 seconds. The video as of late has gotten the "invisible" lines and very jumpy at times. The audio, however, is uneffected. This even happens if I buy a "new" dvd (a never opened(no scratches) dvd from years ago before all the copy protections and dual layers).
Not sure if it is related, but sometimes I put in a dvd, the disk image shows up on the desktop and dvd player opens. But when it goes into full screen to view the movie I get a black screen with the timer counting down from 3hours, and like 12 min.(I always have my timer showing remaining time). If I press eject, dvd player freezes and force quit doesn't work, I have to shut down. I found if I just force quit and restart dvd player with the dvd in the drive it usually gets going. Really I wouldn't be surprised if the drive is dying, though I'm sure you can understand its the last thing I want to hear.
Anything anyone could think of would be greatly appriciated. Thank you in advance.
PowerBook G4 17" Mac OS X (10.4.7)

try a factory reset of your hub no ISP will guarantee wireless speeds as wireless is subject to to much external interference
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This is what I believe is happening. I don't see what I might not be freeing. I remove all event listeners and remove the TextFields from the display list. Is there anything else I need to do?
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