As a general PA rule ....

When powering up, turn on (in this order)...
1. Instruments.
2. Mixers.
3. Amps/Powered Speakers.

When powering down, turn off (in reverse from above) in this order... i.e.

1. Amps/Powered Speakers.
2. Mixers.
3. Instruments.

As for SYSTEM CHECKS on AUDYA if you get an error during bootup, proceed as follows ...

With your AUDYA turned off, press and HOLD DOWN F1 while turning on your AUDYA.
AUDYA will displays a white screen and goes into system check mode.
Use appropriate F1-F10 to manually check for all hardware devices and report device which fails to your dealer as that device might need to be further checked or replaced.

Ofcouse, this assuming there is no 'loose' connection within the board!

Thanks,

AJ

[This message has been edited by Ketron_AJ (edited 10-22-2010).]