Problem with Marshall Amp

[CPTino3001]

Thought I would run this by someone to see if anyone had any ideas...

I was playing through my Marshall MG100DFX today, and all of the sudden the volume cut to about half, and when I tried turning it up, I got hardly any of its full volume.

I've never had a problem with it before, but this time I had a Boss DS-1 plugged into the effects loop to give my signal a little boost. It's a solid state amp, and I don't know if I blew a fuse (if there are any) or if something else is wrong. The speaker seems fine, just not the amp.

I'd appriciate any help.

[jeffro]

First just plug your guitar directly into the amp to see if its something in your effects loop.

[Machtimus]

i would check the chord your using. And depending on what instrument you're using, you might have a battery powering active pickups. you may have to replace this battery. But most guitars and basses do not have these.

[CPTino3001]

It's not the chord, my Les Paul has the stock pickups which are passive, and I tried unplugged everything from the effects loop.

I did however narrow it down to maybe being a problem with the wiring in my guitar though and not the amp. When the volume starts to cut out, if I hit the strings harder than usual and try to force the signal through at a higher volume, it sometimes kicks back to normal for anywhere from a few seconds to a couple of minutes.

I don't know if its worth taking out the humbuckers and taking a look inside the guitar, but if anyone has any ideas on that let me know.

I also noticed though that the problem is pickup independant, becuase switching to either pickup individually does not solve the problem.