Overheating amplifier

I recently purchased an Airport Express, and connected it to my lovely 5-year old Arcam A22 Stereo amplifier (with which I have had no issues in the past).
Within a couple of days of having connected the Airport Express, the amplifier overheated and the circuit-protection kicked in, switching itself off. I thought it might have been a power-surge that caused the problem, so I continued to use the amp after cooling down for a while. After a couple of weeks, the amplifier overheated again, and continued to do so repeatedly until it simply stopped working.
I have now sent the amp off for repair which could be quite expensive as it is no longer within warranty period, and I'm a bit reluctant to plug the Airport Express in again, just in case it is the cause of the problem. I'll be very disappointed if I can't stream my music from my iMac to my stereo anymore, as that was the whole point of spending the extra money buying the Apple wireless router!!
Has anyone else had a similar issue??
iMac   Mac OS X (10.4.9)  

Steven,
Welcome to the forum.
You connect the cable modem to the Airport Express via an ethernet cable - that is if the cable modem is compatible with the Airport Express.
Use Airport Admin Utility to configure the Express and that's it.

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              RealPlayer Plugin: Version: (null) 3rd-Party support link
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              Flash Player  3rd-Party support link
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              /Library/Application Support/Microsoft/MERP2.0
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                        Microsoft Ship Asserts:          Version: 1.1.4 - SDK 10.4 3rd-Party support link
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    Any capacitive load on a circuit will tend to resist changes in voltage, with the result that plugging in a capacitive load will often cause a small spark to form.  Similarly, an inductive load will tend to resist changes in current, which is why unplugging a running electric motor will also often cause a small spark to form.  The transformer in a power adaptor, when connected at the other end, is a capacitive load.
    The trick, of course, is being able to differentiate between these effects and sparks caused by short-circuits in the socket or plug, which can be extremely dangerous fire hazards.  Certainly if there are other indicators of a short-circuit, like heat being generated, then it must be checked out.  In fact, if there's any uncertainty, it should probably be checked out.
    However, explaining that there can be sparks in a perfectly functioning socket is not the same as telling people that sparking can, or should, be ignored.  If anything, it's telling them not to ignore it, but to investigate it.

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