Xperia X10 Mini/pro :: Sony Ericsson Screen Gone Black

i bought a sony ericsson xperia x10 mini a couple of weeks ago, works fine but i was downloading live wallpapers from android store and there was one called DIY wallpaper and it made the lock screen look like an iphone one. so i installed it and it asked me if i wanted to change my home screen to the new one and i clicked yes, then my screen went black. I can use the drop down bar but if i click on a notifcation in there nothing comes up on the screen. I can see the start up screen and all that and the unlock screen it all works just no home screen. Ive tried reseting by holding lock button and home button for 4 seconds it resarted but it was the same i could only use the drop down bar.and one more thing, ive connected to computer but i cant get it to do the usb connect because i cant click it on the phone screen.