Ibook g4 won't power on but i am able to charge battery

i have an ibook g4 and it used to work fine until one day. may have been dropped.. but now when i try to turn it on by pressing the power button nothing happens.. the charger light comes on and it charges the battery but the laptop won't turn on with a full battery or with ac power adapter plugged in... i haven't really tried anything yet and i haven't tryed a different power adapter or battery... does anyone have any ideas.....

I am having a similar problem to this issue with my daughter's ibook. She came home to a dark grey box that states you need to restart your computer hold down the power button for several seconds or press restart button. However, when she goes through those steps she ends back at the same box. Any ideas would be appreciated. I do hear some funny sounds coming from the system on boot-up.

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