Hi Steven,
The procedure to reset an edge to factory default is to press the reset button for 5 seconds.
If it doesn't work, you might need to re-image the device using the following procedure: http://www.cisco.com/c/en/us/td/docs/switches/lan/cisco_edge_300/software/release/1_4/configuration/guide/ce300cg_book/Trouble.html
Regards,
Nicolas