video interference, moving horizontal lines

wierd stuff man, im about to install my own screen in tomorrow so i'l tell you how it goes.. hopefully i dont blow up or anything because it will be my first install - as i sed i am a complete beginner at this :)

well i have successfully installed my screen in my glovebox... it is only temp cos i am getting a in-dash screen in a couple of months. i wired my ground to the existing stereo ground and i added my power to the acc wire that goes to the stereo (un-used in my new setup).. this way it doesnt run down my battery after a few days with it on standby.. and the best thing of all, there are no lines wotsoever.. the picture isnt so great cos it is night time here, but it pretty much shows the setup firing on all cylindars :P