[Stratix IV]Ethernet Interface

Hi all,

I am doing a project on Stratix IV.My project relevant with Ethernet Interface,yesterday i can connect and send,receive data with Stratix IV Board over Ethernet Interface but today my friend had configured flash memory and i can not connect with Stratix IV.

Phenomenon :the light physical not woking as some day ago.:cry::cry::cry:

I am very happy if you can help me,please.Thanks for your help !

Have a nice day.