I can't turn my Panasonic Lumix DMC-TZ30 on properly?

Hello,
I tried to clean the lens of my Lumix DMC-TZ30 by following a youtube tutorial, which involved almost pulling the camera apart, then putting it back together again. After putting it all together again, the zoom didn't retract properly, and I was getting System Error (Zoom) message, so following another tutorial, I pulled it apart again and managed to get it back to normal, but the lens cover isn't closing completely, & when I turn the camera on, the zoom doesn't extend at all - it's like it's jammed in. Any ideas of how to fix it?