IMac dies after airport card insertion

I have an iMac G5 (edu version) that I wanted to upgrade with an airport card from another iMac G5. I inserted the card and connected it, did not touch or change anything else, and when I pressed the power button, an explosion occured about where the power unit seems to be and smoke came out. Since the the iMac is dead. How can this be?

Hmm- the card must be compatible. It's an original Airport card that came from another iMac G5. Installed incorrectly is a possibility, but I don't see how. The installation is quite idiot-proof and I'm only a 50% idiot
Coincidence, however, sounds quite unprobable.
Maybe some loose part fell into the power supply and caused a short circuit while I moved the iMac from a vertical to a horizontal position. Maybe some mean little animal that had chosen to live in there got effraid and urinated on a circuit. There are indeed many more possibilities than meets the eye
m

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