Audio Problem.. NO SOUND when editing!

I need some help, while editing i must have accidentally used a shortcut that has now caused my video to have no sound. The soundtrack is still there. I just cannot get it to play no matter what i have tried. I have tried reimporting a similar video and overlay the soundtrack from that video but its still silent.

Can anyone advice me what could be done? The edits are all ready and the only thing left is to get the sound to work.

Thank you in Advance!

[Tony Rivera]

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