Lenovo 6435, 6438, 6437, 6436 manual Power problems

Power problems

vFollow the suggested actions in the order in which they are listed in the Action column until the problem is solved.

vSee the parts listing in the Hardware Maintenance Manual to determine which components are customer replaceable units (CRU) and which components are field replaceable units (FRU).

vIf an action step is preceded by “(Trained service technician only),” that step must be performed only by a trained service technician.

Symptom	Action
The power-control button does	1. Make sure that the power-control button is working correctly:
not work, and the reset button
	a. Disconnect the server power cords.
does work (the server does not
	b. Reconnect the power cords.
start).
Note: The power-control button	c. Press the power-control button.
will not function until 20	d. If the server does not start, disconnect the server power cords and reseat
seconds after the server has
	the operator information panel cables; then, repeat steps 1b through 1c. If
been connected to ac power.
	the problem remains, replace the operator information panel.

2.Make sure that:

v The ac power cord is correctly connected to the server and to a working electrical outlet.

vThe server contains the correct type of DIMMs.

vThe DIMMs are correctly seated.

v(Trained service technician only) The microprocessor is correctly installed.

3.If you just installed an optional device, remove it, and restart the server. If the server now starts, you might have installed more devices than the power supply supports.

4.Reseat the following components:

	a. DIMMs
	b. (Trained service technician only) Power-supply cables to all internal
		components
	c. (Trained service technician only) Power connector on the system board
	5. Replace the following components one at a time, in the order shown, restarting
	the server each time:
	a. DIMMs
	b. (Trained service technician only) Power supply
	c. (Trained service technician only) System board
	6. See “Solving undetermined problems” in the Hardware Maintenance Manual .
The server does not turn off.	1. Determine whether you are using an Advanced Configuration and Power
	Interface (ACPI) or a non-ACPI operating system. If you are using a non-ACPI
	operating system, complete the following steps:
	a.	Press Ctrl+Alt+Delete.
	b. Turn off the server by pressing the power-control button for 5 seconds.
	c.	Restart the server.
	d. If the server fails POST and the power-control button does not work,
		disconnect the ac power cord for 20 seconds; then, reconnect the ac power
		cord and restart the server.
	2. If the problem remains or if you are using an ACPI-aware operating system,
	suspect the system board.
The server unexpectedly shuts Call for service.
down, and the LEDs on the
operator information panel are
not lit.

Chapter 5. Solving problems 53