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Switch on your amp, keep its volue down to extreme low, and listen if there is still hum through the left channel or not. If still there is hum, the left side power amplifier section inside the amp;ifier is faulty. If htere is no hum at this state, hum enters thorugh the audio input terminal, and the input wires must be checked for open sheild connection. OK.
try taking out the capacitor and wire the amp up with out it. it sounds like the cap is back feeding or discharging voltage when it should not be . if you reinstall the amp with out the cap and noise goes away buy a new cap or do away with it .
if the pc runs windows vista they won't work in less they have a power but if the pc runs windows xp try to install the drivers for the speakers here is the download link http://www.user-guides.co.uk/download/free/freedrivers/free-drivers-installing-dell-a215-speakers.html
The humming is always there you just can hear it better when the cd is playing. The humming is caused by the electrical system in your car. There is an inline filter you can buy and insert it between the car's power source and the head unit. I had a head unit I bought that was absolutly terrible until I installed that filter.
Also if you did a do it yourself job on your amp wiring it is usually best practice to run your RCA cables on the opposite side of the car as your power cable.
You can also purchase shielded spark plug wires which is a source of noise usually of a different kind tho.
First make sure you have a good ground. This means that you have grounded your amp to bare metal not painted metal.
If that didn't work put in the inline filter on the head deck as they are only $20 available at radioshack.
If that doesn't work, go back an wire your car right this time and put the power and RCA on opposite sides of the car.
If you still have that hum it may be the spark plug wires but that sounds more like static than hum.
You have a text book case of alternator hum...