SQ7 All Output is sounding noise

SQ SQ Troubleshooting
1

My Sq 7 all output channels are sounding pink noise.

So, i can’t not use my sq mixer in my church . Plz give me adives.

What is the main problems?

2

First, check if the signal generator is deactivated.

3

Mute all busses.

LR, Aux, Grp, Mtx.

Is the noise still there?