i have had my dell xps 1645 for around a year now i bought it off a website second hand last night it just shut down now when i turn it on all i get is a flashing mute light and the volume up and down are solid lights.

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The s/w volume control within windows (7) works fine, but I believe the touch controls from the monitor are like a "master" volume control and I just cannot get these to work. The problem appeared a few months after I got the system, it was working fine up until then,