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.

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So even when you turn all the gain down, but have the volume up the amp starts feeding back?
2011 Gibson Honeyburst LP Trad. w/ SD Whole Lotta Humbuckers
2014 Gibson Ocean Water Standard Plus
Marshall Haze 15W Head/Cab
Hughes & Kettner Tubemeister 5
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.