Actually by follow the instructions for getting to the DC-in connection.
If you remove the rf shield
- at the back of the connector
- gently pull back on the top of the center tab
- form a gap that the tip will fit through
- you can push the broken power cord tip out the back of the connector.
Reassemble - get a new power supply - and away you go!
See my addition at the end of the DC-in repair guide.
(sorry for the bad picture)
picobrew