If the power cord got very hot, then that means it's either faulty or too small or gauge to handle to power being pulled through it.  You need to get a new, bigger gauge cable to start.  Then you can determine if there was damage to the miner or psu (probably not).  The miner likely shut down due to lack of power due to the crappy cable.

If the power cable got hot where it plugs into your adapter, then it could also be caused by the adapter.