1) Patch for the fall update(search on Google for it)/ Insert the NXE Update disc before the error screen pops up
2) Reflow the Southbridge
3) Southbridge X-Clamp Fix
4) If Software related, the JTAG Hack might work to fix it.

Details for Error code E71/1013:
This error is related to a failed dashboard update, can also be NAND related if you have an Infectus chip....
It can also often be caused by a cold joint under the Southbridge(if it wasnt caused by an update).
According to XBH: Error within Xam

#xbox-experts.

PS. If you cant manage to fix it your self you can always send it to me for a repair always happy to help! but it will cost of course. PM me i don't use Skype.