Well the whirring sound might be

by R. Proffitt Moderator - 11/18/12 10:10 AM

In Reply to: Panasonic SA-HT640 acting weird by oldadmark

The fan. Any good tech can get in there to clean the unit and if you are very lucky the cleanup will help. Fans do not last forever so get a quote from the shops on how much to change that fan.
Bob