Unit is plugged in but no lights, no sound, nothing....can hear a slight pop in speakers when it is un-plugged

Turn radio on and unplug speakers one at a time until you hear sound one of your speakers is blown and when it shorts it does something to the sound and cuts totally out..once u find the bad speaker and un plug or replace it will work

Well...as you said...the unit powers up...so you don't have a "dead set".I don't know if the speaker can be disconnected from the unit.As a rule of thumb...it is very rare that both channels (left and right )fail at the same time...it is usually one channel while the other speaker still operates.This is what I want you to do...In a quiet room..get really close to the unit...Switch it on and listen for any sound from the speakers...get really close...you should hear a slight hum from the woofers and a high frequency "hiss" from the tweeters....If no sound is heard..switch the unit off..You should hear a "plip" sound...If not...switch it on again...you should hear a slight "bump" sound from the woofers...If you hear no sound from the speakers at all..there is a problem with the output stages of the amplifier section.If you do hear sounds fron the speakers,,Turn up the volume and watch for an increase visually on the display (such as ascending numbers).If there is no indication of a volume increase...The "mute" may be stuck on..Try switching it off and on...please let me know what happens after you do all the tests....Looking to hear from you......PEACE!!!
ok...

Make sure you have power to the unit. Do you see indicator lights that show the unit is working. Speaker switch on?

Check that they are plugged into the Green socket. Open Volume control from the taskbar and check that Wave and Volume controls are turned up. If still nothing, check the speakers by plugging headphones in in place of them. Hope this helps. :)

You didn't mention >>>>> if it worked before you added the Monster cables and banana plugs <<<<<.

Nor did you say what you found when you checked the speaker wires. If you found nothing you still need to investigate further.

When you make a change and things go south you have to start UN-making the change to find out what went wrong.

Faint sound overall usually means a Tape Monitor or Mute function is active.

Not a fuse. First thing, to check your speaker (amp unplugged, of course), touch the + and - speaker connections to a 9V battery. If you don't hear a pop sound then your speaker is blown. Thus, no output sound. If speaker is OK, then the output IC is your problem.

This worked for me on my M604: Try inserting/removing a headphone plug into the jack several times to see if that clears the problem.

The "popping" sound is very similar to the sound that the unit makes when inserting headphones into the 'headphone' jack on the back of the unit.

The jack has a contact switch that triggers a relay inside the unit. If that contact switch is 'on the verge' of making contact, slight temperature changes may cause deform closer to it's contact target. The subsequent capacitance build-up and discharge across the gap could explain the cycle of popping noises after the unit warms up.

THANK YOU DUDE, WHO SUGGESTED JIGGLING THE EARBUD JACK. IT WORKED!!! NOW WOULDN'T IT BE WONDERFUL IF VERIZON NEW THIS - THEY WANTED ME TO ORDER A NEW PHONE.

Might be that the chip is bad, make sure that nothing is muted in your volume control also check that digital doesnt have a check on it. some times when digital has a check it wont let you hear anything.

check the audio out port..A faulty port can result in the on board speaker cutting out or muting out. try connectting an external speaker jack into the audio out port and slightly wiggle it.

I do not recommend but open up the unit and check for dry solder at the speaker end

If all ok, it might be a faulty speaker coil. replace with similar impedence