why wont my car stereo work anymore?

Thumper

New member
i have a clarion car stereo that i really love, it was working great until yesterday , one of my stupid drunk friends was playing around with the buttons and now it doesnt work at all and when i turn up the volume button the digital display screen says the words "AMP GRD" . what the heck???? i am so upset , what is "AMP GRD" anyway? is there some way i can reset it or does that mean my speakers are blown?
 
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