Line 6 FBV Express 4 Button Footswitch/Line 6 Spider IV 75W 1X12 Guitar Combo Amp. I was playing my guitar and my pedal display blinked with an "L", and now I can't get any sound from my amp. i plugged my guitar into a different amp and it worked fine. I powered off the amp, tried disconnecting the rj45 cable and i still cant get sound out of my amp besides a little pop sound when I power up the amp. All lights are on on both the amp and pedal. Everything looks and appears normal, just no sound. I've owned and played on this amp for about 3 months with no issues until yesterday. please help