I recently purchased on eBay a Pioneer SX-737. Supposedly has been reconditioned. Looks good and worked great. Turned it on today and it's dead. The red stereo light comes on but no other lights come on and no noise from relays, no sound from speakers. I unplugged it and waited 10 minutes, turned it back on and got the same thing. After sitting turned on for several minutes all functions returned. Powered down and back on same thing, only the red stereo light is on. Anyone have suggestions on what to look for. Hoping for a simple fix, thanks in advance.