If the electricity fails or the AC input cord is left unplugged for about 2 weeks, the memorized contents will be lost.
Should this happen, memorize them again.
Do you still have the remote control? Fresh batteries?
According to the back panel diagram at the start there is a CD input as well as an AUX...
Get the devil out of Dolby and DTS modes altogether and start over.
OKAY...why not just call Sherwood? Technical support is 1-800-962-3203, and you need to use the sherwoodusa.com site * in this case it was http://www.sherwoodusa.com/service/service_trouble.asp