Needing help with my 4x12

[D.Vial]

Hello guys, I was trying my new Peavey XXX with my celestion's loaded Randall 4x12 and I found out that only the right side speakers were working, I thought "this is weird" so I open it hoping that a cable might be off or something like that, but everything seems to be ok, so I a bit confused.

The cab has at the back a switch that says Mono or Stereo, It's in mono right now with the XXX working on 8 ohms, should I switch something here?

Please help me!

 

[Joelegend]

I suppose you only connected one cable to your cab? And not 2? Maybe your switch is just broken or wrongly wired.

 

[D.Vial]

Yup I only connect one cable to my cab.. I never had this problem before so it's weird

 

[Joelegend]

Switch your amp to 4 Ohm, and plug into the 4 Ohm connector on the cab. If it works again... something is probably wrong with your cab