My iBook will not display after Power up Chime

Please I need Help.
My iBook (16VRAM) Does not display after the power up chime. so i have tried to reset the PRAM by holding down CMD, OPTION, P & R after the chime, But Nothing Happens, I dont hear a second chime (I dnt Knw how long am suppose to hold down the keys, But i held it for 2 mins and still nothing)
Please help.
Thanks.

Welcome to Apple Discussions Aaron
Force quit in the middle of an installation spells "trouble". Try starting the computer in Safe Mode. If successful, restart the computer and see if it fully boots. If not, you more than likely have directory damage that needs to be repaired. Disk Utility may be up to the task.
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