i gather you've tried removing all power from socket and wait 1 minute and then see what happens when power is re applied . I have heard that sometimes the gearing does have a problem sometimes and a gear splits but you'll have to strip the bugger down to check that . If you've got kids they haven't tried to insert a disc while one is already in !!
good luck
and just in case try here dealextreme.com/details.dx/sku.16025