PB G4 stuck on grey screen at startup

I've got a PB G4 running 10.5. Everything was going fine until a couple of weeks ago when startup started stalling at the grey screen, sometimes with the apple logo and spinny thing sometimes just blank grey. After reading up on this, I popped in the original discs and ran disk utility. It ran for a while (there were lots of red errors flying by, most of them said the same thing, something about reserved file does not have data...?), and at the end it said one volume was repaired and one volume could not be repaired. I tried the repair permissions button, but that wouldn't work.
Last night, I had to yank out the HDD so I could get files off of it for work. Assuming that my HDD is working (picking up an enclosure tonight; fingers crossed) and that I can cram everything back in and close up the PB, is there anything to be done? I understand that this laptop is quite mature, but was hoping to get some more time out of it.
Thanks!
Brian

When you get a volume cannot be repaired message from Disk Utility, you have a few options. If the error is a soft error, that is, where pointers or index are scrambled, a program like Disk Warrior or TechTool Pro can usually straighten things out. If those programs can't fix it, then it's usually a hardware problem. You could erase the hard drive writing zero's to it to see if that fixes it, although that may be temporary. If that doesn't work, buy a new hard drive, which may cost less than Disk Warrior and TechTool Pro. A program like SmartUtility can show you the SMART sensor indicators, which can sometimes help you with making a decision on buying a new drive. You can download from http://www.volitans-software.com/smart_utility.php

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