Dell Precision 420 - Manual (Page 94)

If the Dell Diagnostics identifies a faulty RIMM, replace that RIMM . If the Dell Diagnostics determines that the system board is faulty, or if the
Dell Diagnostics does not identify the cause of the problem and the problem is still not resolved, see " Getting Help " for instructions on
obtaining technical assistance.
Troubleshooting the Video Subsystem
Troubleshooting video problems involves determining which of the following is the source of the problem: the monitor, the monitor interface cable,
or the integrated video subsystem.
Before you attempt to troubleshoot the video subsystem, perform the procedure found in " Troubleshooting the Monitor " to determine whether the
monitor is the source of the problem.
If the monitor is not at fault, perform the following steps:
1. Check the monitor cable connections as indicated in " Checking Connections and Switches ."
2. If the problem is not resolved, see your video card documentation for further troubleshooting instructions.
If any of the tests fail, see "
Getting Help " for instructions on obtaining technical assistance.
Troubleshooting the System Board
A system board problem can result from a defective system board component, a faulty power supply, or a defective component connected to the
system board. If an error message indicates a system board problem, perform the following steps:
1. Insert the Dell Precision ResourceCD into the CD-ROM drive, and reboot the system. Run the System Board Devices test group in the
Dell Diagnostics .
If any of the tests fail, see "
Getting Help " for instructions on obtaining technical assistance.
2. Turn off the system, including any attached peripherals, and disconnect all the AC power cables from their electrical outlets. Also, disconnect
any telephone or telecommunication lines from the computer.
3. Remove the cover from your desktop chassis or from your mini tower chassis .
4. If you have a mini tower chassis, remove the AGP card brace according to the instructions in " Removing and Replacing the AGP Card
Brace ."
5. Verify that the power cables from the power supply are firmly connected to the connectors on the system board.
6. If you have a mini tower chassis, replace the AGP card brace.
7. Replace the computer cover on your desktop chassis or on your mini tower chassis , reconnect the system to an electrical outlet, and turn it
on. If the problem is not resolved, proceed to step 8.
8. Perform the procedure in " Troubleshooting Expansion Cards ." If the problem is not resolved, proceed to step 9.
9. Perform the procedure in " Troubleshooting the Keyboard ." If the problem is not resolved, proceed to step 10.
10. Perform the procedure in " Troubleshooting a Dead System Board With the RTCRST Jumper ."
11. If the problem is still not resolved, see " Getting Help " for instructions on obtaining technical assistance.
Troubleshooting a Dead System Board With the RTCRST Jumper
If the system cannot boot and you have exhausted all other troubleshooting options, perform the following steps:
NOTE: Dell Precision WorkStation 420 systems are equipped with diagnostic LEDs to help provide information about possible
problems. Make note of any LED codes you observe before contacting Dell for technical assistance.
NOTE: Dell Precision WorkStation 420 systems are equipped with diagnostic LEDs to help provide information about possible
problems. Make note of any LED codes you observe before contacting Dell for technical assistance.
CAUTION: Before you remove the computer cover, see " Safety First —For You and Your Computer ."
NOTE: Dell Precision WorkStation 420 systems are equipped with diagnostic LEDs to help provide information about possible
problems. Make note of any LED codes you observe before contacting Dell for technical assistance.