Flickering horizontal white stripes on screen

Full Apple Hardware Test passed.
Power Management Unit PMU is reset.
White horizontal stripes covering the picture appear sporadically.
Sometimes entire screen gets white and returns to normal after a while.
Sometimes entire screen is covered with vertical gray scale stripes.
Stripe flickering is synchronized with hard disk or DVD-ROM drive sound.
PowerBook G4 Titanium   Mac OS X (10.3.9)   400MHz

Try finding someone who can look at it, thats what i did with my ipod and they fixed the screen and its good as new, may be you need a new screen even tough the screens not smashed or is it?

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    How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
    - If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
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    - Try on another computer                                                       
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      Apple Retail Store - Genius Bar                              

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    Try:                                               
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    - If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
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