When the switch detects a problem, the Alert LED turns amber, and the Status field lists the detected problem. From the Diagnostics window (mentioned in the below URL) you can run switch and link diagnostic tests to solve the problems that the switch finds POST.

If you cannot solve a problem through the diagnostic report or by reconfiguring a feature, either restarting or resetting the switch might help to solve the problem or help you to eliminate probable causes.

The following URL may help you:

http://www.cisco.com/en/US/docs/switches/lan/catalystexpress500/release_12.2_25_fy/user/guide/trouble.html#wp101449