Marantz SR-940 Marantz SR940 has no sound coming from it. Hasn't been used in years. Plugged several speakers to it and no results. what could it be.

No, it is a Surround Sound Receiver for taking television signal, or a signal from another device and amplifying it to multiple speakers..

https://www.google.com/search?q=Marantz+SR+68

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Try switching the speakers over. If the sound now comes out of the faulty speaker the amp is faulty. If it doesn't the speaker is faulty.
If you can't find a replacement speaker, then buy a new pair of speakers. Match the ohms found on either the unit or old speakers with the same. The watts of the speaker can be the same or higher than the original.

Check for shorted speaker wires - if none found, disconnect speaker / select headphones and see if you hear music thru the headphones. If not - you may have burnt out power transistors, etc.

Some amps have a button which you press to mute the speakers when the headphones are plugged in. Sometimes marked "Speakers on off". If it hasn't then a new headphone socket would not be expensive to fit. As long as the amp producers sound I don't see any future problems. The previous owner may have used the headphone socket a lot, and simply wore it out!

I will interperate this as:
"So you want to play sound through your Marantz SR-4200?"

You need to clarify what sort of system setup you have, however i will put down a few ways to wire this up to your TV.

If you have a Set-top-box that gets the TV Channels, that is where the sound comes from. If you have a TV that plugs straight into the wall, you will have to get the sound from the TV. Grab a RCA Stereo cable - (White and Red heads, if you don't know what they look like, Google it).

If you are unclear about this, i have tried to make a diagram down the bottom to explain how this is to work. What you will do is Take the sound from the Set-Top-Box or TV and reroute it into your fantastic Marantz SR-4200.

1. Plug Red Plug into the the Red Slot, and White into the White on the back of your set-top-box or TV Out (if you get it around the wrong way, the speakers will be reversed.)

2. Plug the other end of the cable into the back of your Marantz SR-4200 in the TAPE input or VHS input as they are analog signal inputs. Turn on Marantz SR-4200 and turn it onto Tape or Vhs (depending on where you plugged it in).

[Set-Top-Box or TV out] >-------> into >------> [Marantz SR-4200]

If you still don't get it, then try searching You-Tube for a guide "Plug Tv into Stereo". I myself couldn't turn up anything useful

Swap the speakers with each other to isolate the speaker from the wire and the amp. What fails now? Isolate accordingly.

It's probably not heat due to the Marantz' large frame and heat-synchs.
This could simply be a mismatch of impedance. The amp is 120w per channel, so make sure the speakers can handle this. Check the impedance (ohms) of the speakers and the amp as well. Clipping can be caused by overpowering the speakers, which could damage the speakers in the long-run.
If this is only from 1 source- (i.e.- Blu-ray player or cable) then it could be digital clipping.. This Marantz can decode 96kHz PCM or normal Dolby Digital & DTS. If this is a Blu-ray it may be streaming 192kHz PCM... (but most likely the Marantz will not even attempt to play that audio)
I hope this helps.

Press AMP then OK on your remote. If the menue does not appear press 9 on the remote. You must have your monitor connected through composit Monitor Out or S-VHS.
Also check your multiroom settings. Maybe your OSD signal is diverted through to other room. I do not have SR-7200 any more, unfortunately.

please invert your cable and watch if the problem moved the problem in your cable change it with new one.from any radio shack near you or any electronic store.