Hey, I have the same problem.
The input usually gets green when it receives the signal from the guitar.
Now, the input signal doesn’t get green and I got no sound.
I have troubleshooted by:
1. plugging my guitar directly to the speaker: my guitar works
2. changing the cable: cable works
3. booting the helix to factory settings: input signal still doesn’t work
Is there a fix to this issue?