IBM 8490, 8485 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 Problem Determination and Service Guide 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 front-panel assembly power-control button is working
not work (the server does not
	correctly:
start).
	a. Disconnect the server power cords.
Note: The power-control button
	b.	Reconnect the power cords.
will not function until 20
seconds after the server has	c.	Press the power-control button.
been connected to ac power.	d. If the server does not start, bypass the front-panel assembly power-control
		button by using the force power-on jumper (see the Problem Determination
		and Service Guide on the IBM xSeries Documentation CD). If the server
		starts, reseat the front-panel assembly cable and repeat steps 1a through
		1c. If the problem remains, replace the front-panel assembly.
	2. Make sure that:
	v The power cords are correctly connected to the server and to a working
		electrical outlet.
	v The server contains the correct type of DIMMs.
	v The DIMMs are correctly seated.
	v The LEDs on the power supply do not indicate a problem.
	v The microprocessor is correctly installed.
	3. Reseat the following components:
	a. DIMMs
	b. Power supply cables to all internal components
	c. Power supplies (hot-swap models)
	4. Replace the following components one at a time, in the order shown, restarting
	the server each time:
	a. DIMMs
	b. Power supplies (hot-swap models)
	c. (Trained service technician only) Power supply (non-hot swap models)
	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 “Solving undetermined problems” in the Problem Determination and
	Service Guide on the IBM xSeries Documentation CD.
The server does not turn off.	1. Determine whether you are using an Advanced Configuration and Power
	Management (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 holding 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. (Trained service technician only) If the problem remains or if you are using an
	ACPI-aware operating system, suspect the system board.

Chapter 5. Solving problems 73