The iPad1 screen is held in the main body of the iPad by a series of clips located around the edge of the screen. It sounds as though one of those clips is either broken or has become dislodged. If your iPad is still under warranty, then I'd return it to the Apple Store and they will replace it for you. If it's not under warranty, you might be able to effect a repair yourself - depending upon how confident you are at that sort of thing - I can send you a link to a set of instructions that will guide you through replacing the clip - but it's a delicate job.
If you do decide to return your iPad to the store, then make sure you take a backup with iTunes to begin with. It might also be worth calling the Store in advance to check they have a replacement in stock.
Hi Tom thanks for advice could you send me the link so I can have a go myself as it's out of warranty.Is there a possibility of damaging it thru stripping it down??
I need advice on how put films from iPad into iTunes.I bought a used iPad and came with 8 movies on and don't know how to put them in my iTunes without losing them??? Help please