|Hi Joanne, I would first try cleaning the DVD Unit as the lens may be dirty/dusty..|
Here in the UK, cleaning kits are available from cheapo stores such as Poundshop.(where everything costs £1)
Choose the kit that has a small bottle containing cleaning liquid - some kits don't!
As a matter of interest, where are you based.? I am in West London.
Good Luck - Keep us posted.