Question about Marshall MG100HDFX 100-Watt Amplifier Head

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Marshall mg100hdfx loud fuzz and distortion and no guitar sound

When I turn my MG100HDFX on distortion all you hear is fuzz and you can barely hear the guitar sound. When it's on clean, i get the same fuzz and NO guitar sound. Help?

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I would think the other way, IF you hear fuzz or hear anything at all, your input is fine, wiggle the speaker plug around and listen for changes. You probably have a dirty socket on SPEAKER OUTPUT.

Posted on Mar 08, 2013

  • Joe Patch
    Joe Patch Mar 08, 2013

    I would also wiggle the master volume and check as well. If it is static and scratchy, just working it up and down to see.

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There is clearly a problem with your input jack or cable. This should be covered under the warranty.

Posted on Jan 20, 2010

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Check your input (guitar signal).
Also, check your gain and volume levels.
Make sure that you have a reliable, steady, and clean power source as well.
If the problem persists, contact the store from which it was purchased. There are a lot of things that can go wrong internally with the cheaper Marshall models.

Posted on Sep 28, 2009

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Marshall mg100hdfx head. I get no sound whatsoever plugged into the guitar input but the controls seem to work as I can hear changes in the light ambient static. I will get sound however if I plug directly...


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Marshall MG100HDFX, VERY loud painful humming/noises as soon as the amp is turned on. Cant be adjusted by volume or anything, is this a connection problem?


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I'm having some crazy feed back with either my amp and i'm not sure what its from or if its my guitar but, every time i go to practice or to play a show i kill peoples ears. Now i play death metal and i...


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The sound on my mg100hdfx cuts out sometimes then its fine what could this be


Common problems are broken or intermittent input jacks or cracked circuit board or soldering or broken volume controls. Another one is a bad switch contact on the jack for PA input connection. All these are internal and require servicing.

External problems are guitar and cable problems.

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