My HK AVR630 is constantly shutting down. I know it is not from over heating since I added an external fan to it to avoid this. Plus, after turning the receiver on when it is ice cold, it shuts down after around 20 seconds. This has been going on for the last day. I can't keep the receiver on without it shutting down.

Anyone have any ideas what else to look for? Loose wire maybe?

Shag