Does anything come up on the serial console?  If so, please post the serial console capture up until the point that the switch stops booting.

Hi,

      Thanks for your reply. There is no output on serial console.

-Randy

Oh, no.  I have thought dual image design is safe.

Now what I have is a half-dead switch, when connecting the port with a cable to a 1.0G NIC, the switch LINK led is green and the NIC status on server is also "Connected",

No way to save it?

Regards,
Randy