My 2nd computer is my previous Apple Powerbook G4 aluminium 15.g 15 inches.
recently, when it is on, working, and so the screen is at +/- 90 degrees angler beacuse it is open... i get that weird bar at the bottom of the screen... some horizontal "lines or noise". The size of it it maybe 25% of the ehight of the screen.
When I move my screen back and front I can get to an angle where it disapera...
It could be the LVDS cable that provides video signal to the screen. That's the most common cause of angle-related display problems. It either gets pinched in the hinges, or just wears out with use. It's possible to replace it, though likely to cost more than the computer is worth in labor. The part is cheap - maybe $50.
The LVDS cable is not sold separately in later model PowerBook G4's, therefore an entire display assembly would be required - IF it's the LVDS cable; it's possibly a defective LCD panel. In addition, Apple no longer supplies parts for such an old unit, so repair options are limited to none.
__________________ ACMT MacBook Pro (15-inch, Mid 2012) 2.3 GHz Core i7, 16GB, 256GB M4 SSD iPhone 8 - 64GB S/G • Sound System Audio Engine A2 • Display UltraSharp U2412M 24" Custom Built Gaming PC Kaby Lake Edition | 16GB DDR4 | GTX 1070 8G
so I guess their is no way to have it cheaply done, just changing that stupid wire and use that PPC as a living room laptop for another 1 year.... sad. (For maybe a 50$-100$ I would had done the repair, then use it, then sell it for cheap price)
You might want to look on ebay. You can find G4 screens and LVDS cables there for pretty cheap. Hook it up to an external monitor first and see if you can replicate the problem first. Could just as easily be a logic board issue.