Dell PowerEdge 2550 - Manual (Page 57)

When you turn on or reboot the system, the Caps Lock and Scroll Lock indicators on the keyboard should flash momentarily and then turn off. If the Num Lock
category in the System Setup program is set to On, the Num Lock indicator should flash momentarily and then remain on; otherwise, it should turn off.
Abnormal operation of these indicators can result from a defective memory module in socket DIMM_A or DIMM_B.
To troubleshoot system memory, perform the following steps:
1. Turn on the system, including any attached peripherals.
Is there an error message indicating invalid system configuration information after the memory count is completed?
Yes. Go to step 2.
No. Go to step 7.
2. Enter the System Setup program to check the system memory value. See "Using the System Setup Program" in the User's Guide for instructions.
Does the amount of memory installed match the system memory value?
Yes. Go to step 8.
No. Go to step 3.
3. Turn off the system, including any attached peripherals, and disconnect the system from its electrical outlet.
4. Open the system doors (see " Opening the System Doors ").
5. Reseat the memory modules in their sockets.
6. Close the system doors, reconnect the system to the electrical outlet, and turn on the system.
7. Enter the System Setup program and check the system memory value again.
Does the amount of memory installed match the system memory value?
Yes. Go to step 8.
No. Go to step 9.
8. Reboot the system, and observe the monitor screen and the Num Lock, Caps Lock, and Scroll Lock indicators on the keyboard.
Does the monitor screen remain blank, and do the Num Lock, Caps Lock, and Scroll Lock indicators on the keyboard remain on?
Yes. Go to step 9.
No. Go to step 13.
9. Repeat steps 3 and 4.
10. Swap the memory modules in sockets DIMM_A and DIMM_B with a pair of DIMMs of the same capacity.
11. Close the system doors and reconnect the system to the electrical outlet.
12. Reboot the system, and observe the monitor screen and the indicators on the keyboard.
Is the problem resolved?
Yes. You have fixed the problem.
No. Go to step 13.
13. Run the system memory test in the Dell Diagnostics.
Did the test run successfully?
Yes. You have fixed the problem.
No. See " Getting Help " for instructions on obtaining technical assistance.
Troubleshooting the Video Subsystem
Troubleshooting video problems involves determining which of the following items is the source of the problem: the monitor, the monitor interface cable, the
video memory, or the video logic of the system. You can also have a high-resolution video expansion card installed, which overrides the video logic of the
system.
The following procedure troubleshoots problems with the video memory and video logic only. Before you begin, perform the procedure found in
"
Troubleshooting the Monitor " in "Checking the Equipment" to determine whether the monitor is the source of the problem.
WARNING: See "Protecting Against Electrostatic Discharge" in the safety instructions in your System Information document.