G4 hardware fault - how do I diagnose?

[diziet_hack]

Hi all,

 

I'm working on a friend's G4 867 Mhz MirrorDoubleDoor (MDD).

I put a new CPU fan in, and I think it might not have been powerful enough and I think I've damaged the CPU.

 

Everytime I try and boot, be it from the Leopard install DVD, or the new HDD (which had Leopard running fine for a week) or the old OSX hard disk, it gives me a kernel panic almost immediately.

 

I've got 4 screen shots of what happens (in Verbose mode) and I took some low res video as well since if it doesn't hang/freeze, it shuts itself down without a word.

 

The shots are here:

This is more or less the first screen that fills up during a verbose boot - very early on in the boot up.

 

http://www.atiic.com/IMG_0001.JPG (it freezes after this)

http://www.atiic.com/IMG_0002.JPG (it freezes after this)

http://www.atiic.com/grab1.png (it shuts itself down after this)

http://www.atiic.com/grab2.png (it shuts itself down after this)

 

My questions:

 

a) Is this a CPU fault?

Is there anyway of telling what hardware fault this is?

 

This is the slowest G4 Leopard can be installed on but it wasn't that bad...

I can buy a 2nd hand CPU from ebay but if I don't know for sure it's the CPU, then I don't know if I should.

 

Can anyone help with this? Any pointers at all would be very cool.

It happens at around the same time every boot time.

I've tried a different DVD drive and disc, and no joy.

 

Thanks.