Ibook G4 problems - broken or not?

Hi All (new to here),
I was using my G4 (adobe, word) and then tried to start safari as well. The screen went fuzzy, so I turned it off incase something was being damaged (had a processor fry before). When I tried to restart, the fan kicked in first for a couple of seconds, then start up noise, but then black screen came up, a line of black and white dots came along top of screen (then faded away) and a white light kinda of moved through the black screen,finally the whole screen went black. I tried a couple of times to restart but same thing.
Then I left comp off, came back next day and it started up no problems, functioning fine. Unfortunately this only lasted for approx 5 minutes before the screen froze. I restarted it again and all was fine for a couple of more minutes. Then subsequent start ups was a repeat of above. I have been trying to get it going but it just does either of described above (works well for 5 mins or starts up into black/white screen).
Finally I have tried to use Install disks to reinstall but the comp freezes during the process and I never get anywhere. I also started up holding C (with disk in drive) or holding shift (no disk), but no luck. Because it works intermittently I am not sure if there is actually anything wrong and is just a software thing that I am not sure how to fix? Or is it on its last dying legs?
Thanks All.

first and foremost - back up your data.
it could be that the display cable is getting pinched inside the case (where it connects by the hinge). depending on how adventurous you are feeling, you could follow the take apart guide for your model over at ifixit.com:
"If your backlight isn't working, the inverter may be bad. Other parts that may be bad are the display or the logic board. *If your backlight fails intermittently while moving the display, the problem is with the inverter cables.* Otherwise it is impossible to test for damaged parts without replacing them one by one. If you are comfortable taking apart the display assembly, replace the display inverter first, then replace the LCD. If you are not comfortable with this, you can replace both parts at once by replacing the display assembly if you have a processor speed of 1.33 GHz or less. Choose this display assembly if you have a 1.42 GHz Processor. If this still doesn't solve your problem, you need a new logic board."
you could try emailing ifixit's tech support. i think they would be more willing to troubleshoot your problem and sell you parts or a repair solution.
i have also found that the genius bar isn't up to speed on fixing older macs (more than 2 years old). they would rather sell new, cuz that's what they do...

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