Kernel panic and artifacts on the screen

[migakira]

Hello everyone!

I'm having kernel panic on my 2006 24" iMac A1200.

Also, there's small artifacts (little colored dots) on the screen. Can I assume that this is a GPU problem? Maybe GPU and Logicboard?
If it's the GPU, is it easily replaceable?

THese are the screens with the kernel panic message and artifacts

 

[WilliamG]

Are you sure those artifacts are part of the screen, and are not just debris or something?