Hi,

Are the speakers analogue or SpeakerLink connected?

Does this happen on first powering up, if you cycle the power (hard switch, not standby) does it correct itself?

Next time it occurs, put directly into standby and cycle through the cards present using display button, do they all register with an appropriate level of firmware (NOT 0000)?

If all is OK, select 'cal' mode and cycle through all speakers present, do they all produce the 'cal' noise?

This information will help to eliminate faulty cards or the usual 'G' series problem the PSU and everything associated with it!

Paul.

Sceptical ... At First!