Cisco Systems 3550 manual “Technical Specifications.”, Results” section on page, Problem, Solution

Chapter 3 Troubleshooting

Diagnosing Problems

Table 3-1describes some common problems and their solutions.

Table 3-1 Common Problems and Solutions

Problem	Solution
System LED is not on, and the	• Check that the power cable is connected to the switch and to a
switch does not run POST.	known power source.
	• Test the power cable on another switch.
	• Connect a working power cable from another switch.
System LED is amber.	• An internal fan fault is detected. Either check the switch itself,
	or use the show env user EXEC command to check for a failed
	fan.
	• The switch might be overheating. Use the show env user EXEC
	command to check for an overtemperature condition. If there is
	an overtemperature condition:
	– Place the switch in an environment that meets the
	environmental requirements given in Appendix A,
	“Technical Specifications.”
	– Make sure that the fan intake and exhaust areas are clear.
	• A fatal POST error is detected. See the “Understanding POST
	Results” section on page 3-1.

Catalyst 3550 Switch Hardware Installation Guide

OL-6155-01 3-3