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it maybe interference picked up through an unsheided or poorly sheided cable or through single coil type pickups rather though the amp itself. You might also try get your power for the amps and this unit through different circuits.
Make sure your power supply is doing its job. check output reading w/ a ohm meter and compare it to the info on the back of the supply. i am assuming your using tje recommended power supply. if this does not prove to be the cause. you may have send it out for diagnostics and most times it's just cheaper to buy new. good luck
You say the clip light is always on, as the only clip lights on this mixer are on the effects channel and the master output and you do not say which is on there are a number of possibilities. You may have the effects turned up too far as this should not be showing, just maybe blinking, turn them down on efx2 on all strips as well as on the effects processor and see if this helps. If it does you may be able to find where the hum is coming from by gradually increasing each until you find it.
If you are getting the clip on the main mix master and you are not being deafened and the humming sound is coming from the speakers not the mixer you may have a subsonic signal getting into the mixer. Disconnect all inputs and if this cures it go through until you find where it is getting in and sort that.
If the humming is coming from the mixer it is possible that the smoothing caps on the PSU are dying, you do not say if you are getting normal sound as well as the humming from the mixer.
When asking for help please try to give as much information as possible
Make sure you are using BALANCED interconnection cables to the speakers, either XLR or TRS connections. ALSO make sure all interconnected equipment such as the speakers AND the mixer are powered from the SAME receptacle at the venue... yes you have to run extension cords... the pro's do it so they don't have hum and other noise and don't damage their equipment.
Make sure ALL of the interconnected equipment is powered from the SAME receptacle to avoid ground loops due to the safety ground. DO NOT Use two wire power or use ground lifting plug adapters. Make sure you use balanced lines, either XLR or TRS cables. Do NOT use TS cables.