Try to boot from the CD the computer shipped with.
Insert CD and restart the computer holding the "c" key Your computer should boot.
If so run disk utility from the cd and repair the disk as well as permissions. If this is successful your computer "should" be repaired. If it still has problems booting, Use your CD to perform a Archive and install which should keep all your personal settings and installed software intact.
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Basically some causes of blue screen is the RAM check the RAM remove first maybe it is clogged by the dust. Remove the dust of the memory stick and insert it back to you computer. Usually of you have this problem again you need a recovery disk. Load a windows CD to your CD drive you need to boot and repair the windows.
If you have the original install CD or the OSX CD, boot to CD. To do that you must insert CD, restart PowerBook and hold letter "C" on keyboard while computer is starting, then take the first steps towards installing the OS, when you get to the bar on the top go to Tool>Utilities>Disk Utilities then select the drive a do a disk repair. That may fix the problem and bring your system back to booting normally.