Just Bought a DK cabinet, having sound issues

[Resyk]

Just bought a DK cabinet yesterday the seller had one of the audio cables disconnected due to the volume od the speaker but we plugged it up and it worked. Once i got the cab home all i hear is a loud humming sound. Any thoughts? Im thinking that maybe something came loose from the move. Im going to take a look later and will add pics to hopefully have someone help resolve this issue

[YesAffinity]

Firstly, congrats on picking up a DK!  Would love to see some pics of the cab in general. 

Now to your issue.  It's not uncommon for the speaker to produce a hum when no game audio is being produced.  Usually a cap kit on the audio board can help with the buzz/hum.

However, are you saying that even when game audio is supposed to be playing, there is only a hum and no game audio?

Some things to check:

audio volume pot on the remote board - make sure it didn't accidentally get turned down, so that all you are hearing is the native hum
Follow the cable back from the speaker to the audio board.  Make sure everything is connected up as it should be.  Also beware, if you find more than one thing unplugged at the audio board, there are two connectors that are nearly identical and can be hooked incorrectly.  If they are hooked up incorrectly, bad things happen (your audio board will fry).
Check all power cables from the power supply to the game board, and make sure they are all connected.  If the game PCB is a 4-board set, going from memory, it requires a dedicated power connection from the power supply to the sound ("SOU") board, which the 2-board set does not.  Someone correct if I'm wrong on this.

[Resyk]

So it is a 2 board set and i followed the cable from the speaker to the board and everything seems to be hooked up. So i have No game sound or anything just a loud hum. take a look at the photos see if they help

[Resyk]

another pic

[YesAffinity]

^^In the second picture, the 2-pin sound cables appear to not be connected

^In this picture, the cables appear to not be fully connected.

A couple potentially dumb questions:

1) You have started a game to test audio?  There is no attract mode sound natively on DK boards.
2) You turned up the volume pot on the remote board (next to the monitor chassis), while a game is in progress?