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Problem Solving Using a Subsystems Approach
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Troubleshooting the Power Subsystem
Check the following to help isolate a problem with the power subsystem:
Note
If the system powers off, wait at least one minute before manually rebooting the system, or it will pause
indefinitely.
Table 5-1
Symptom
System begins power
on, amber STATUS
LED comes on.
System does not
power on.
Cisco 7201 Installation and Configuration Guide
5-4
The PWR OK (power ok) LED is green when the system has powered on and is attempting to boot
the software, or has booted the software.
The ENABLED LED on the port adapter or service adapter comes on when the processor completes
its initialization of the adapter for operation. An ENABLED LED indicates that the adapter is
receiving power and has been recognized by the processor; it does not indicate the state of the
individual interfaces on the adapters. If an ENABLED LED fails to come on, proceed to the
"Upgrading the Boot Helper (Boot Loader) Image" section on page
When all LEDs come on to indicate that the system has booted successfully, the initial system
banner should be displayed on the console screen. If it is not displayed, see
"Specifications"
to verify that the terminal is set correctly and that it is properly connected to the
console port. If the ALARM LED is on, check the STATUS LED and PWR OK LED.
Troubleshooting the Power Subsystem
Possible Cause
System has failed to boot
Cisco IOS.
AC power cable not fully seated at
system or at the wall outlet (power
source).
DC power cable not turned on at the
panel board of the circuit breaker.
AC internal power cables are not
fully seated; from the power supply
to the system board, from the power
supply to the power switch, and the
power supply to the power
connector.
Chapter 5
Troubleshooting Initial Startup Problems
5-8.
Appendix A,
Possible Solution
Power off, and reboot the system. Check
to be sure you are using the correct
Cisco IOS release. If Cisco IOS does not
boot, and the green STATUS LED is not
displayed, contact a service
representative.
Turn the router power switch to the
standby position (|) and reseat the AC
power cable at the system or at the wall
outlet (power source).
Turn the router power switch to the
standby position (|) and locate the circuit
breaker on the panel board that services
the DC circuit, switch the circuit breaker
to the on position.
Turn the router power switch to the
standby position (|) and unplug the router
power cable. Open the cover and check
the power supply cable connections.
Reseat the cables if necessary. Replace
the cover, plug in the power cable, and
power on the router.
OL-11364-04
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