One way of proving it ISN'T the amp circuitry is to remove the pre-main jumpers and jack in a source that has its own volume control (or try a CD that starts really low) because this bypasses ALL the amps controls. If it sounds ok (albeit LOUD) I'd suspect oxidized contacts on the controls. Turn it off and vigorously operate all controls a zillion times to wear through it. In mosty cases it's the unused controls that fail because they never get wiped. Maybe a shot of contact cleaner on those you can access.
http://www.overload.it/supporto/643/manuali/NAD-C350.pdf
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Damage to elictronics can be done by improper humidity.
Get online
and got to www.google.com In the google search box type: "HP
Support" (without the quotes and put your manufacturer name before Support).
Look for downloads and drivers. Enter your model number and operating
system when requested. Download and install the Audio drivers.
Try using the VLC Player. It comes with drivers and codec. I've seen it solve many sound issues.
Try using VLC as your player. Go to www.google.com and
in the search box type "download vlc" (without the quotes).
Look for the Video Lan download from site www.videolan.org/vlc Download
and install it. It downloads and installs in 3 minutes or so. It's
a very fast player, smooth and it can play just about any type of dvd formats
and media. It's totally FREE.
click start control panel sounds and audio,volume,advanced,speakers select the appropriate speakers from the drop down list or navigate to the device manager scroll to system devices + to expand,system speaker right click properties then select use this device (enable) also you might check
the speakers plug/outlet is usually at the back of the computer you will have to open up the computer to check the lead attached to the rear of the input plug make sure the connection is good
try cleaning your computer of dust using a fine air blower from a compressor making VERY sure that there is no MOISTURE in the air line specifically around the sound card and the CPU central processing unit dust causes static to build up in a computer
hope this helps you
if you dont have a motherboard disc you will have to download the drivers
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