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A bad ground results in compensation by raising amperage. amplifier requires X amps. When it cant get that it drops voltage and goes into protection (5 v). The computer does not require as many amps so it can compensate by upping amperage below the threshold of your power flow.
Basically you have a bad ground. Its not so bad for low amperage devices but those that require large loads are shutting down (amp). Also keep in mind that a computer will run at a lower voltage so even if the connection is bad, it will still run.
The fact that a battery close works proves that.
Id also like to point out that a non regulated power supply in an amplifier will contiinue to draw current directly related to the impedence, so if you have the amplifier loaded down to a 1-2 ohm load, or even a short, the amp will try to draw current until it runs out or over heats. So check your grounds and make sure there are no shorts in the speaker wires/amp
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