E73: I/O Hardware Error - Couldn't calibrate HSIO Bus from
edram: this error is likely caused by a problem with the Ethernet port
or supporting control devices.
Here is a link to a temporary fix. I DO NOT RECCOMEND YOU DOING THIS as it may do more damage to your 360. USE AT YOUR OWN RISK!!!
http://gameolosophy.com/consoles/xbox/how-to-fix-xbox-360-e-73-error-temporary/
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