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Chapter 7 Maintenance and Troubleshooting
46
1. Verify the power is good and available.
2. Ensure the Server is turned on (the power-on light should be green and the fans should be on).
3. Turn the Server off and unplug the power cord.
a. Wait 30 seconds and plug the power cord back in.
b. Turn the Server back on.
c. Verify the failure.
4. Verify all boards are installed properly and seated firmly in the slots with cables firmly connected.
5. If you have added any memory, make sure the DIMMs are seated properly on the system board.
6. If the Server stopped working after you installed a new accessory, turn off power, remove the accessory
and turn on the Server.
If the Server now works, go to Step 8.
7. If the Server still does not work, remove all the accessories you have installed (do not remove the
flexible disk drive, CD-ROM, or the bundled hard disk drive) and turn on the Server.
8. If the Server now works, turn off the Server and:
a. Add one accessory at a time to determine which one is causing the problem.
b. Turn on the Server after installing each board or option.
c. When the problem returns, the last board or option installed is defective.
Operating system or an application is not responding properly
1. In Server models with accessible cache feature, determine if the memory cache feature is turned on or
off.
Memory cache may need to be turned off for some older software. It may also need to be turned off for
those accessory boards that have on-board firmware, and for those boards that use memory-mapped I/O.
2. If necessary, turn off the memory cache feature.
a. Check the state of memory cache and, if necessary, disable it:
b. Push <F2> during the boot process.
c. Go to configuration and turn off Memory Caching.
Server stops working (hangs)
Typically, if the Server hangs before the end of POST completes, the problem is probably a hardware failure.
If the Server hangs after the POST completes, the problem is probably due to an incorrectly configured or
corrupt driver, operating system, or application program, or a media (disk drive) error.
If the Server stops working, try the following:
1. Review the Troubleshooting Checklist before you continue.
2. Power down the Server and unplug the power cords.
3. Wait 30 seconds and plug the power cords in and power on the Server.
4. Verify the failure has disappeared or is still present.
5. If the problem persists, replace the system board.
6. Once a problem has been found with a part, verify it is the problem (or the only problem) by reinstalling
the part and replicating the error.
Server does not start (boot)
1. Locate the memory modules (DIMMs).