No Video out coming from the computer

i had my logic board replaced about a year ago and now my computer is acting up again. it starts and boots fine but the screen is just black (its not the backlight cause i see nothing). i know it boots ok because on my desktop i shows up under my network places and i can access the harddrive fine. before the screen went totally black got a message that said that mac OS X had unexpectdly quit. my question is is it the logic bard again or is it the OS X. any help would be much appreciated.
iBook G3   Mac OS X (10.4.10)  
iBook G3   Mac OS X (10.4.10)  

Hi, and welcome to Apple Discussions.
How big is your hard drive and how much space remains available on it?
How do you know it's not the backlight? Have you tried shining a flashlight through the back of it?
If you have access to the hard drive via your network, it's not the logic board, and probably not your OS X installation. Suspect the inverter board, possibly, if it isn't the backlight cable, or you may need a whole new display.

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