I have changed the screen on an e-system 3089 uk laptop. Now it wont start-up at all.?

Disconnect your new screen and see if laptop boots. If so try old screen again. This will narrow down the problem. If neither screen allows boot up it is likely that you have disturbed a connector, just open up and detach and re-attach everything that plugs in. Also make sure you haven't strained a wire and broken a joint.