specialk:
Because you say in the topic that you have an 80GB Ipod Video, I assume that you are using an "80GB" build too and so suggest trying a "30GB Ipod Video" build. The difference is actually not the hard disk size but the available RAM size. Usually the 80GB Ipod Videos come with 64MB of RAM but some seem to only have 32MB like the smaller Ipods and Rockbox has currently no means of adapting live to it (hence there are two different builds). I think you can find some more similar reports in the forums here.