IBM Type 7977 manual Power problems, Symptom, Action, Documentation CD

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 Problem Determination and Service Guide on the IBM System x Documentation CD 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 (the server does not
	a. Disconnect the server power cords.
start).
	b. Reconnect the power cords.
Note: The power-control button
will not function until 20	c. (Trained service technician only) Reseat the operator information panel
seconds after the server has	cables, and then repeat steps 1a and 1b.
been connected to ac power.	v (Trained service technician only) If the server starts, reseat the operator
	information panel. If the problem remains, replace the operator
	information panel.

2.Make sure that:

v The power cords are correctly connected to the server and to a working electrical outlet.

vThe type of memory that is installed is correct.

vThe DIMM is fully seated.

vThe LEDs on the power supply do not indicate a problem.

vThe microprocessors are installed in the correct sequence.

3.Reseat the following components:

	a. DIMMs
	b. (Trained service technician only) Power switch connector
	c. (Trained service technician only) Power backplane
	4. 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 switch connector
	c. (Trained service technician only) Power backplane
	d. (Trained service technician only) System board
	5. 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.
	6. See the Problem Determination and Service Guide on the IBM System x
	Documentation CD.
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 power cord for 20 seconds; then, reconnect the 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.

86IBM System x3500 Type 7977: Installation Guide