Marshall fx100. I know its shit but its all I got. Didn't give me any trouble before. I sit, turn it on, and immediately an incredibly loud squeal. Turned all the knobs down and still, he second I turn it on my ears bleed. What the **** happened?
Are you using a speaker cable? Also try vacuuming/blowing compressed air into the fan on the back.
Yes, like I said it had been working until today.
So even when you turn all the gain down, but have the volume up the amp starts feeding back?
Now its working again?! I'm so confused....
Did you check to see if your cables were loose? Or if they have some bad connections that was possible connecting the hot and ground connections together for whatever reason.