the easy way to explain it:
http://www.youtube.com/embed/vfN3wGjtSQQ?hd=1

I have an 2G iPhone with jailbreak... I bought a Macbook last december and I cant get it to sync with this! I was able to do it without problems in my old Windows netbook, but now its my brother's and doesnt have my stuff anymore... I have readed that its in some weird mode of Genius itunes stuff and that I need to put in Activation mode so it can sync with the Macbook...
The iPhone syncs correctly with iPhoto and the Agenda... but when i do what i did in the video theres no change in my apps nor music :/ I tried downgrading itunes to the ver. 9.2 because i think thats the one i had on my netbook, but its the same that happens with the last iTunes' version...
Any ideas?

With all the information you gave, you didn't tell us what actually happens when you plug in and attempt to connect or sync with the device. Can you please do so? We'll be able to help once we have enough information. All I can reasonably assume is that video, audio, and apps do not sync -- are there any error messages presented? Have you Authorized the computer against the iTunes store for the Apple Store account that you are utilizing? These are key bits of info we'll need.