Powerbook G4 freezing at blue bar startup

Hi there
I have a Powerbook G4 Titanium (1Ghz processor) 1Gb RAM. For nearly 5 years it has given me no problems. I have Tiger 10.4.8 installed.
A week ago it suddenly started to get very slow and required restarting 3 or 4 times before the problem seemed to go away. Then a few days later the problem returned, this time much worse, so I ran Cache Out X, which seemed to help for a while. Then today it ground to a halt and when trying to restart it just froze.
In the last 10 hours I have tried the following:
Booted up from the Tiger install CD and successfully ran the Repair Disk Permissions in Disk Utility.
Booted up from the Apple Hardware Test CD and successfully ran the Extended Test, which passed everything okay.
However, I cannot Safe Boot (Startup with Shift) or reset the Pram (Restart with Command-Option-P-R), as in both cases it only ever gets as far as the grey Apple logo.
I also cannot re-install Tiger, as the 60Gb Hard Drive is 58Gb full and Tiger needs more space to install...but of course I can't free up space because I can't startup properly to access the files on the Hard Drive.
After trying all the above, if I start up normally now then the grey Apple logo and the grey startup animation stay on the screen for maybe 10 minutes, then the startup window appears and the blue bar takes around 2 minutes to reach the right hand side of the window, but then nothing. The blue bar stays full permanently, but OSX never gets to the desktop.
As a last ditch attempt I've opened up the Powerbok to try and locate the Pram and take out the battery, but I've been unable to do this.
It's worth noting that when booted up from the Tiger install CD I also tried to Repair Disk (rather than Repair Disk Permissions) and got an error message saying "Invalid sibling link. Volume check failed. First Aid failed. The underlying task reported failure on exit". I'm not sure what this means.
Does anyone have any thoughts on what to try next?
Many thanks all you Mac gods out there!
KB x

Lucia:
I am glad you were able to remove some of the information from the HDD. I suspect that you have some kind of hardware issue, maybe even the HDD, but we can't be sure until we do a bit more to be sure it is not software related. Next, then, try this:
Repair Disk
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 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, and report if it says anything but 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.
If DU reports errors it cannot repair you will need to use a utility like Tech Tool Pro or Disk Warrior
Let me know how it goes.
Good luck.
cornelius

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