I have a yamaha rgx 121-fp and when i play it there is no sound from the amp

i have tried new amps, new leads etc but still nothing has changed!

any ideas what the problem is email me richardfrazer91@msn.com

take your input jack out carefully and check if a wire is loose or something.....or take it to a shop...
**Schecter Demon**
Epiphone Zakk Wylde Les Paul (Camo)
Ibanez RG-350DX
Ibanez GAX-70
Ibanez IJ-70
**Valveking 212**
Fake cube 60
Ibanez Jumpstart amp
EH Metal Muff
GLX Distortion
Zoom G-2.1u
1. faulty input jack
2.loose internal wiring
3.Dead pickups
4.Faulty cable
5.U forgot to turn up the amp volume