Crash - "Corrupt Skip Lists"

Hi,
I had a system crash recently, the kind in which everything freezes and you get a failure report on top of the current screen. It read, among others, "Corrupt Skip Lists". (I made a photo of this, so I have other details)
Somewhere on the net someone suggested that one of my RAMs might be broken, so I tried running the computer with only one at a time, but still it's not running very well. The main problems are crashes in InDesign and Photoshop, but occasionaly a system crash happens as well. Oh, and the Apple Hardware Test doesn't work from the system CD either - I don't even get the option to start it via restart/alt.
Anybody any ideas of what else might be wrong, or what I might could try?
Thanks,
B.
Power PC G4 Mac OS X (10.4.8)
Power PC G4   Mac OS X (10.4.5)  

It probably wouldn't hurt to run Disk Utility, and check out the hard drive. Also, repair permissions from Disk utility is also good to do.
Having removed RAM, it would be wise to reset the PRAM/NVRAM. This is adviseable anytime hardware is added, or removed. Here is how to:
http://docs.info.apple.com/article.html?artnum=2238
OnyX is fairly good for maintenance routines, but can't really help in isolating trouble. A good, all purpose utility is TechTool. It checks most everything.
If the crash issue continues, and no other hardware problems can be found, you may want to reinstall the OS.
G4 AGP(450)Sawtooth   Mac OS X (10.4.8)   2ghzPPC,1.62gbSDRAM, ATI9800, DVR-109,(IntHD)120&160,LaCie160,23"Cinema Display

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