MY IBOOK 4G WILL NOT REBOOT

My ibook 4g will not reboot.... I will turn on and hear the chimes but the I see some flashhing folder and then the Aplle logo will just get stuck.

Hello and Welcome to the Support Community
A flashing folder would indicate one of three things.
1. You trying to boot from a network device that's not available
2. Your iBook does not have a OS installed.
3. Your Hard drive has failed.
If it gets stuck on the Apple Logo, it means that it's trying to load a OS but having some difficulties.
Has this iBook been upgraded recently? New memory, hard drive, OS?
Which iBook do you own?
Do you know what version of Mac OS was installed on this iBook?
Try resetting the PMU and see if that provides you with any solution.
We are going to need further details of what iBook it is to assist you further.

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Help- My ibook G4 will not boot up. When I Turn the computer on the apple symbol shows up and the clock continues to spin. I tried to start it up from the disk and at first I could select my hard drive, but then the start up failed. When I tried to start it up again I was no longer able to select my hard drive.
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That sounds like your onboard RAM is defective. Unfortunately that RAM is not replaceable only the logic board it sits on.
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Welcome to the Support Community!
To resolve the issue with your BlackBerry® Curve™ 9300 smartphone not rebooting, please try the steps in one of the following KB articles.
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Come follow your BlackBerry Technical Team on Twitter! @BlackBerryHelp
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Hello Everyone,
This is a problem I've been having for about a year but now I'm finally trying to fix it. My iBook G4 will not go to sleep. It doesn't matter what method of putting it to sleep I use. Using software to select sleep, or the power button and clicking on sleep don't do anything. Closing the lid just turns off the screen, but then the computer doesn't have power if I open it much later and is still running if I open it quickly.
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tried without airport extreme card (which came with the ibook) - didn't help
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%SRR1:00003030
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Now realized that I don't know the CPU speed and size of your iBook but it probably doesn't matter since they're all pretty much the same but then again....
Here's something from that post that I referenced:
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http://developer.apple.com/documentation/Hardware/DeveloperNotes/Macintosh_CPUs-G4/12inchPowerBookG4/2_Architecture/chapter_3_section4.html
"Power Control IC
The power manager IC in the 12-inch PowerBook G4 is a Mitsubishi M16C/62F microprocessor, also called the PMU99. It operates with its own RAM and ROM. The functions of the PMU99 include:
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MY IBOOK 4G WILL NOT REBOOT

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