HP ProCurve 4000M Installation Manual page 42

Troubleshooting
Diagnosing with the LEDs
Tip
Number Problem
In the slot
corresponding to
the letter that is
flashing, a module
was installed that is
a different type
than the previously
installed module,
and the switch has
not yet been reset.
A fault condition
has been detected
on the power
supply installed in
the slot
corresponding to
the flashing
number.
One or more of the
switch cooling fans
may have failed.
The network
connection is not
working properly.
3-6
When you "hot swap" modules in the switch slots, if you install a different module
type than the one that was previously installed in the slot, you must reset the switch
so the switch processor can properly initialize and configure the new module type.
The flashing LED informs you that this change of module types has occurred. The
module will not work properly until the switch is reset as indicated by all the module's
LEDs staying on until the switch is reset.
You can reset the switch by any of these methods:
• pressing the Reset button on the Switch Engine Module
• power cycling the switch
• selecting the reset or reboot option from the console, web browser interface, or
HP TopTools.
Try removing and reinstalling the supply.
Caution: Make sure that the AC power cord is disconnected from the supply before
removing and reinstalling the supply.
Reconnect the power supply to the AC power source. If the error indication reoccurs
after the supply is reinstalled, the power supply may be faulty. Call your HP-
authorized LAN dealer, or use the electronic support services from HP to get
assistance. See the Customer Support/Warranty card for more information.
Try disconnecting power from the switch and wait a few moments. Then reconnect
the power to the switch and check the LEDs again. If the error indication reoccurs,
one or more of the fans has failed. The switch has three fans and may continue to
operate OK under this condition if the ambient temperature does not exceed normal
room temperature, but for best operation, the switch should be replaced. Contact
your HP-authorized LAN dealer, or use the electronic support services from HP to
get assistance. See the Customer Support/Warranty card for more information.
Try the following procedures:
• For the indicated port, verify that both ends of the cabling, at the switch and the
connected device, are snug.
• Verify the connected device and switch are both powered on and operating
correctly.
• Verify that you have used the correct cable type for the connection.
- for twisted-pair connections, in general, for connecting to an end node, use
"straight- through" cable; for connecting to MDI-X ports on hubs or other
switches, use "crossover" cable.
- for fiber-optic connections, verify that the transmit port on the switch is con-
nected to the receive port on the connected device, and the switch receive port
is connected to the transmit port on the connected device.
• Verify that the port has not been disabled through a switch configuration change.
You can use the console interface, or, if you have configured an IP address on
the switch, use the web browser interface, or HP TopTools for Hubs & Switches
network management software to determine the state of the port and re-enable
the port if necessary.
• If the other procedures don't resolve the problem, try using a different port or a
different cable.
Solution