I personally have fixed most e73 errors by replacing the xclamps, re heating all the solder on the mainboard and replacing the heatsink paste with new.
e73 errors when searched for on the net say its something to do with the ethernet port BUT ive found it to be the lead free solder on the mainboard around the ethernet port which is at fault not the port itself.
you need to search the net for 3rrod fix and you need to do this yourself or take it to a repair center if your unsure how to do it.
out of 50 e73 errors ive fixed around 49 doing what i mentioned above.
run a search for 3rrod guides on the net or youtube.
if you get stuck email me
Linda
xboxrepairkit
SOURCE: error E73
it looks like your ethernet port is fried...try disconnecting your cable to it and see if it boots....if it does your going to have to go wireless, it uses usb. good luck!
SOURCE: E73 error or 1021 error code
here is what the error code means
E73: General Hardware Failure: Ethernet port... this error is caused by a problem with the Ethernet port.
and cose 1021 is a ghost code they have no idea from what i have found out
SOURCE: xbox 360 error code e73
E73: General Hardware Error: Ethernet port... this error is caused by a problem with the Ethernet port.
SOURCE: sysem error E73 on Xbox 360
Follow the steps below, Hope this helps
1. Turn off the xbox 360, disconnect the cables wait for 20 seconds reconnect the cables and turn it back on.
2. Remove the hard drive, turn on your xbox 360 without the hard drive.
3. Re attach the hard drive and turn on your xbox 360
4. If the steps wont resolve the issue, your console needs to be serviced. Contact Xbox Customer Support to check the warranty status of your xbox 360.. Good Luck!
SOURCE: xbox 360 doesnt work because of one red light and message of E73 that they dont know how to fix
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.
You can try to find some parts online, but it looks like your Ethernet port is bad...
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