Start-up problems, black screen or open firmware

My iBook G4 1.33GHz Dual USB, with 1 gb RAM memory has been troublesome lately. It's installed with the latest version of OS 10.4.9
When starting up the ibook, it will sometimes only show a black screen after the boot chime. Repeated force restart sometimes makes it boot up the open firmware (white screen).
Then I see the error message:
"Illegal instructions at: %SRR0:ff85e778 %SRR1:00081000"
When I continue on with "mac-boot", I get the blue screen with a question marked box. So it can't find the startup disk.
This usually only happens when I'm done working for the day and close the lid on my ibook without manually clicking on the sleep mode when I put in in my drawer,. I've seen several times that the screen is still on when I close the lid, so it will continue to burn battery time.
I've managed to get the ibook to boot properly after removing the battery and letting it "cool-down" for 15-20 min. Also, zapping pram, vram sometimes works, but I don't know how much that actually helped. It worked once when I typed in the reset-nvram in the open firmware screen too.
I'd rather not have this happen at all! Any suggestions? Is this the much-talked about RAM memory failure?
Any suggestions would be very appreciated.
Message was edited by: antony chen

HI,
*"I get the blue screen with a question marked box."*
That can mean several things. One, the drive is failing. Two, your iBook can't find a System Folder to boot from. Try booting while holding down the Option key which will prompt the Startup Manager window.
MemTest
Boot from your install disk and check the hard disk for errors.
Insert Installer disk and Restart, holding down the "C" key until grey Apple appears.
Go to Installer menu (Panther and earlier) or Utilities menu (Tiger and later) and launch Disk Utility.
Select your HDD (manufacturer ID) in the left panel.
Select First Aid in the Main panel.
(Check S.M.A.R.T Status of HDD at the bottom of right panel. It should say: Verified)
Click Repair Disk on the bottom right.
If DU reports disk does not need repairs quit DU and restart.
If DU reports errors Repair again and again until DU reports disk is repaired.
When you are finished with DU, from the Menu Bar, select Utilities/Startup Manager.
Select your start up disk and click Restart
While you have the Disk Utility window open, look at the bottom of the window where you see Capacity and Available. Make sure there is always 15% free disk space. Not enough disk space can cause directory corruption.
If you cannot boot from your install disk, try booting in Safe Mode
A flashing question mark appears when you start your Mac
Carolyn

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