All inputs lights red (clip) no sound at output (monitor)

What letters / numbers that appears on the screen?
If the display is normal, and you can switch to other banks, and can edit each bank, then the problem of no sound, is at the pre-amp IC input, output amp, or CODEC converter.
This is the overall image of G1X inside. Next, we zoom-in the middle of picture above.
See the next picture.
IC2 (left) is input pre-amp IC (NJM2100).
IC4 (middle) is the CODEC IC (WM8734).
IC5 (right) is the IC output (NJU7082).

Test whether the input IC is working normally, turn ON G1X, plug the guitar, go to BYPASS/TUNER menu. When the TUNER function could work, certainly input IC is not damaged.
Means only two possibilities, namely CODEC and output IC. That is not easily tested, except in specific ways.

May also, there are problems in the input / output socket.
Turn ON G1X. Try the following (see figure below):

• Test the output socket. Touch pin output socket (right red arrow) with finger / screwdriver / whatever. If sound is heard in the amplifier, the output socket is normal.
• Test the input socket, Same as above. (left red arrow). (if this happen in this point, problem is clear).

NOTES:
If lcd light are on (as you say), but appearing G1 or d5 or bt, and the system are hang / frozen, this is a different issue to the one described above,and dealt with in different ways too.

References IC datasheet:
NJM2100.
http://www.njr.com/semicon/PDF/NJM2100_E.pdf
NJU7082
http://www.datasheetarchive.com/dlmain/Datasheets-22/DSA-439015.pdf
WM8734 http://www.cirrus.com/en/pubs/proDatasheet/WM8734_v4.4.pdf
.

Would be surprised if this blew the sub of it was off at the time, have you tried the sub with another input source? Is it the clip light or the power light that's on?

INPUTS:
Mic into CH 1
Camera audio output into CH 2
OUTPUTS:
Mains L/R>>>>>>>>>>>>>>DVR/Tape
Control Room>>>>>>>>>>>>audio monitors.

your RCA from your mixers output has to go into the input of your amp. just switch that and you should be fine

Check only one active speaker at the mixer output and report the results.
Connect only one of the audio inputs from the power amp at the mixer output (and the passive speakers at the output) and report the results.
Sometimes (in parallel connections) there are interferences from the volume controls.

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does your bass have active pick ups?
do the ratings on your amp match the ratings on your speaker?
are you using a pedal?
does your pedal have an output adjustment?
have the ground on your bass checked.
make sure you're using the right kind of cable.
and be sure that the outlet you're using is grounded.

Proper level setting of the mixer is important. HOWEVER if the clipping is occuring at the speakers the only possible problem MIGHT be that you have a supersonic feedback that is saturating the speakers above your hearing range, Be sure you don't boost the highs too much with the EQ as this can cause the feedback that you can't hear. Also make sure that you power the speakers from the SAME receptacle as the mixer, even if it means running an extension cord to bring power to the mixer. This is to avoid a low frequency hum and common mode distortion/damage. A low frequency hum could cause the clipping.
It would be a good idea to get a sound meter to check the sound level. You should be able to reach 85 Db from this system without clipping. If you need more than that, you MAY need more speakers if the band instruments are too loud. Also if the band has amps that get into the vocal microphones that adds to the clipping level... make sure the mics don't "hear" the band instruments. Make sure your speakers are toward the audience from the mics to avoid the supersonic feedback problem. If the vocalists can't hear themselves with that configuration you need to set up seperate stage monitors.

There are some pretty good videos on YouTube about proper mixer level setup.

There are several clipping indicators on this board. Do you mean that the small vertical display to the left of the FX selection window is maxed out from top to bottom? I will assume that you have ALL the FX inout knobs CCW for all channels AND the FX slider all the way down. Also does the FX selection knob work to change the effect number? Does the rest of the board work? WILL the effects pass sound when you send it through the effects? You say no sound, but was that just to say with no sound sent to it it still is clipping, or that it will not pass sound?

Thiis amp has plenty of gain for mics. Make sure your mic has a good XLR to XLR cable (balanced) and connects to the XLR input connectors. If you have 1/4 inch jack cables that aren't TRS balanced on the mics, get rid of them and get XLR's.

Then push the PFL button down (LED will light red) for a single channel with a mic and adjust the trim (top knob for the channel) so that the level peaks without clipping on the main LED display when highest input to the mic is being generated. You should not get clipping then during operation.

After that you use the slider tio adjust the level for the mic. The MAIN slider should be at least up around -10 to zero during operation. If your main slider is way down, then you haven't balanced your channels properly. Do the same for each channel as the instructions for the mic above. If the gains of the other inputs are too high and the MAIN slider too low, this is what is causing your problem.

Typically the trims for mics like Shure 58 are about 3 o'clock.

High level guitars may have trims anywhere from 9 to 3 o'clock.

Ideally you will want your channel sliders to be between -10 and zero.

FIRST check that your power adapter is 16 VAC at 1 AMP and that it is the original unit.

The clip lights monitor levels at several points. If you cranked the EQ's for maximum, say bass, that MAY cause them to illuminate.

As a test, set all EQ's at mid point. Remove ALL input cables. Are the lights still on?

It is possible that you can have a ground loop that is putting signals in that causes clipping. Another source is if you have a microphone that may be FEEDBACKING at supersonic frequency that you can't hear... that is why we disconnect all the inputs as a test.

Finding schematics so one can repair these devices can be a problem. If ALL the clip lights ar on, then it is probably the reference level source for the clip level threshold... however finding a schematic would be necessary and while part cost would be probably under a dollar, the labor and time to find the schematic would be unknown.