Ibook G4 freezes on startup help

My Ibook G4 has been good to me for years, I try to keep it clean and up to date. A few days ago out of the blue it froze up on me. I took the battery out and tried to start up the computer. It starts to go through the motions ( white screen with the apple logo and dial spinning below, then changes to blue screen ) Once it gets to the blue screen where it normally loads OSX it just stops running and freezes everytime. Tryed to load the apple care test disc , but it does not work. The apple logo shifts to the side and the computer freezes again. I also tried to use the apple restore disc, to run a hardware test. That will load the disc and start to go through the hardware test. Once it gets to the memory portion of the test it freezes everytime. It does not say the memory portion failed it just freezes. Also trying to do a reinstall of the software does not work, it just freezes shortly after the disc starts to spin.
Any ideas would be helpfull thanks
Ibook G4 (2004)800/756 running OS 10.4.10

Let's take it a step further and reset the NVRAM. Restart and hold down the Appleoption+OF keys. Release them when you see "Welcome to Open Firmware". At the prompt type;
reset-nvram (return)
reset-all (return)
The computer will restart after pressing return the second time.
John

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Ok, so I realize my description is long, but I've been going through these forums gleaning off the wisdom of the past...and so here's what I've tried
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what is the retailer installer?
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Ibook G4 freezes on startup help

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