Troubleshooting The Video Subsystem; Troubleshooting The System Board - Dell Precision 420 User Manual

If the Dell Diagnostics identifies a faulty RIMM,
Dell Diagnostics does not identify the cause of the problem and the problem is still not resolved, see
obtaining technical assistance.

Troubleshooting the Video Subsystem

NOTE: Dell Precision WorkStation 420 systems are equipped with
problems. Make note of any LED codes you observe before contacting Dell for technical assistance.
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
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
2. If the problem is not resolved, see your video card documentation for further troubleshooting instructions.
If any of the tests fail, see

Troubleshooting the System Board

NOTE: Dell Precision WorkStation 420 systems are equipped with
problems. Make note of any LED codes you observe before contacting Dell for technical assistance.
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
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.
CAUTION: Before you remove the computer cover, see
3. Remove the cover from your
4. If you have a mini tower chassis, remove the AGP card brace according to the instructions in
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
on. If the problem is not resolved, proceed to step 8.
8. Perform the procedure in
9. Perform the procedure in
10. Perform the procedure in
11. If the problem is still not resolved, see
Troubleshooting a Dead System Board With the RTCRST Jumper
NOTE: Dell Precision WorkStation 420 systems are equipped with
problems. Make note of any LED codes you observe before contacting Dell for technical assistance.
If the system cannot boot and you have exhausted all other troubleshooting options, perform the following steps:
replace that
"Checking Connections and
"Getting Help" for instructions on obtaining technical assistance.
"Getting Help" for instructions on obtaining technical assistance.
desktop chassis or from your
desktop chassis or on your
"Troubleshooting Expansion Cards." If the problem is not resolved, proceed to step 9.
"Troubleshooting the Keyboard." If the problem is not resolved, proceed to step 10.
"Troubleshooting a Dead System Board With the RTCRST
"Getting Help" for instructions on obtaining technical assistance.
RIMM. If the Dell Diagnostics determines that the system board is faulty, or if the
diagnostic LEDs to help provide information about possible
"Troubleshooting the
Switches."
diagnostic LEDs to help provide information about possible
"Safety First—For You and Your
mini tower chassis.
mini tower chassis, reconnect the system to an electrical outlet, and turn it
Jumper."
diagnostic LEDs to help provide information about possible
"Getting Help" for instructions on
Monitor" to determine whether the
Computer."
"Removing and Replacing the AGP Card