Troubles with my iMac, it won't "start"

Wow.
So where do I begin..
In feb 2005 I bought a iMac G5 20". Since the day I bought it, it has run fine, like a charm.
2 months ago when I returned from a trip, it wouldn't start as it was supposed to. The troubles I got was:
(the boing sound always apears, just FYI)
First few times the screen was fubar (imagine TV-"ant war"-static, but horizonal and in color over the entire screen).
After a while that turned into just a grey screen followed by the fans going berzerk a few times.
I booted from the Install disk and used Disc Utils to see what's up and to run recovery or something like that. Disc utils didn't find the Harddisk. I got freaked and restarted it, and somehow, the computer worked again (I was like "?!")
Now yesterday, I shut the computer down again (dunno why, felt like it should have a good nights sleep or something).
When I started it this morning, I got static-image-ant-war-in-color thing again for a few restarts.
Then I got the following things totally random on boots
- Screen turned into only grey
- Screen grey with apple logo
- Screen turned into a slightly lighter grey
After a few 10-100 boots and running boot with install disk (and not finding the harddisk), I get a new boot error, yes, the old os9 icon with a questionmarked folder.
This lead me to believe that it's the Harddisk that's "broken". But when I run the Hardware Test CD was delivered with the mac, it give me this right after the "Boing"-sound:
INVALID MEMORY ACCESS AT
%SRR0: 00000000.00032ed8
%SRR1: 10000000.00003030
And then asks me if I want to shutdown or continue booting. Shutdown shuts it down, and the continue leaves me with a screen with the color sand/orange'ish.
I'm cluless on what to do now.. more or less.
I've tried:
Reseting the PRAM = Did nothing for me
Ripping all the cables out for +1 minute = Nothing changed
Starting it in FW-mode hooked up to my eMac = Didn't work, eMac can't see it.
Open the iMac and remove RAM and ripout/reinsert the HDD-cables = Nothing
Any more sugestions ?
Oh, I talked to the guys that sold it to me, and I still have warranty and this should cover it, but I REALLY need to run some backups and remove NDA-stuff.

Status update:
I just let the computer run for a good 30 minutes.
First grey screen, then after a while the questionmark-folder, then after 20-25 minutes, the grey with logo and spinning wheel.. and after that, it loaded..
weird eh ?
So now I'm moving everything over to FW-disks and doing a clean install and then turning the thing off hoping to be able to recreate this error tomorrow in order to be able to leave it at the repair-guys,
Here's hoping !

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