Marshall ms-2 little red lights on but no sound

If the tubes are lit, it's not a fuse problem.

Did you try a new 9 volt battery?

Hello,

A common issue with Marshall Amps are generally speaking a low resistor value cracked leg inside the power module, just open up the amp and with the amp unplugged from mains check by a little finger movement the big 2/3W resistors and possibly you will find that one or other will have a broken leg, also cold solder joints do this kind of issue, hope this helps...

How do you have the DIP switches set? That controls the voltages.

This can be due to either a RUNAWAY of some power circuit or there is a dry point of soldering which seems to get aggravated when the board is working or heating.
So when the fault occurs check the power to the amplifier, the output stages. If a tap bring about life then the case of the dry soldering is justified.
If not this can be due to power failure due to semiconductor failure. A tracing with voltage/current/signal will be needed to confirm . USe a multimeter to check the voltage line , check the secondary to the circuits, specially the outputs.

The circuit is being overloaded and turning off automatically, file a claim with Marshall and they will fix it for free
http://www.marshallamps.com/support/support_overview.asp

Insufficent information !!! Are you controlling this by the footswitch or the onboard switch? If the onboard switch and you HAVE at some point used the footswitch, likely the contact on the footswitch jack has failed that transfers control to the internal switch. If you haven't tried the footswitch see if that has control. I can send you the link to the schematics if you know how to read them. Here they are:

http://elektrotanya.com/marshall_mg250dfx.pdf/download.html

Scroll down to the little link that says "Get Manual" and click on it to download.

It sounds like you bought a defected amp. You should contact Marshall and tell them the problem. You should have some kind of warranty.

Read your manuals for both pieces of gear carefully first. You only have one amp so you won't be able to take advantage of all the FX on the Digitech as a lot of them are designed for stereo. The Digitech manual shows guitar into the Digitech and output from the Digitech into input of any guitar amp. Since you have a Marshall and can already get some great sounds by running your guitar straight into the Marshalls input, you would probably be better off using your Digitech in the FX loop. Run a guitar cord out of the send on the loop into the input of the Digitech and a guitar cord out of the left / mono output jack on the Digitech into the effects return jack on the Marshall. Start out with the effects level on the Marshall all the way down. Do the same with the Digitech with both the input and output levels. (Read the manual carefully) I think the choice of the Digitech isn't that great because it is already trying to reproduce a lot of what you can already get with just your Marshall but with a little experimentation and some careful adjustments you should be able to add to the sound of the Marshall. Hope this helps.

please check the speaker leads in the back near the edge of the driver (the heavy metal part I think theres 2 in that cabinet )