PowerMac G5 Dual 2mhz Won't startup - HELP!

Hi all,
I have a G5 (as stated above) running Tiger. Today it's totally fallen over and the fans are going crazy at every opportunity.
It started up fine this morning and then froze, so I tried re-starting it but I'm just getting as far as the Grey screen with the apple logo and 'clock' which spins until finally I get a 'no entry' symbol. I've tried re-setting the PRAM, the SMU and running disk utility. The first 2 made no difference and it crashed midway through running a verify on disk utility ('checking catalogue'). It's also frozen while starting up from the CD.
I'm entirely frustrated and about ready to throw it out of the window... or I would if I didn't have so much bloomin' work to do today that I can't get near! ARRGH!
Anyone have any suggestions please? I'm not hugely in touch with what to do when it all goes pear-shaped, so feel free to talk to me like I'm dense!
I have access to a bashed up G4 ibook in the meantime which gives me access online etc and I guess worst-case-scenario I could use as an alternative start-up disk (please advise!).
Any help gratefully received.
Cheers!
Sarah

Arrgh! So it froze in safeboot and won't startup again... I shall persivere.
To answer your questions->
Have you tried disconnecting everything except display, and wired keyboard and mouse?
*Currently there's the G5 and monitor with the mouse and keyboard connected via the hub.*
If you Option boot - hold down the Option(alt) key on Startup - does Startup Manager find the boot DVD and internal boot drive, and regard them as viable Startup Discs?
*Yes, but... it'll sometimes allow me through to the 'choose your language' screen, sometimes as far as 'repair disk' on disk utility, or sometimes just crashing when I choose the DVD as the starter disk. It's bizarrely inconsistent. How do I just use it as a startup disk without upgrading OR repairing?*
Will the Apple Hardware Test run?
*I'm a bit of a novice (read: eejit!) at this, do you mean the Repair Disk in DU? Or the fsck command? I've done both, is this summit else I should try?*
Were any changes made to hardware or software just prior to the problem appearing?
*None that I can think of. No new software added. A few days ago (maybe a week?) there was a new 'security' update and safari upgrade that I carried out - the standard Apple variety.*
*For a wee while, every now and then the Wacom pad would freeze, but I found that by unplugging it from the hub and plugging it in again that would release it. (at the moment it's disconnected and I'm using an Apple mouse.)*
Thanks for your continued help. I am absolutely thick when it comes to repairing things when they go pear-shaped, so feel free to explain things in as basic a manner as possible.
cheers again,
Sarah

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