Dell OptiPlex GX300 User Guide - Page 47

5. Verify that any cables are firmly connected to their corresponding connectors on the expansion cards. If any cables appear loose, reconnect them. For instructions on which cables should be attached to specific connectors on an expansion card, see the expansion card's documentation. 6. Remove all expansion cards except the video card. 7. Replace the computer cover, reconnect the system to an electrical outlet, and turn it on. 8. Start the Dell Diagnostics by inserting the Dell ResourceCD and rebooting the system. 9. Run the RAM test group. If the tests complete successfully, proceed to step 10. If any of the tests fail, see "Getting Help" for information on obtaining technical assistance. 10. Turn off the system, disconnect it from the electrical outlet, and remove the computer cover. 11. Reinstall one of the expansion cards that you removed previously, and repeat steps 6 and 7. If any of the tests fail, the expansion card you just reinstalled is faulty and needs to be replaced. If the tests complete successfully, repeat steps 8 and 9 with another expansion card. 12. If you have replaced all the expansion cards removed previously and the expansion card problem is not resolved, see "Getting Help" for information on obtaining technical assistance. Troubleshooting System Memory A computer memory problem can be a faulty Rambus in-line memory module (RIMM) or a faulty system board. If a random-access memory (RAM) error message appears, the computer probably has a memory problem. 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 option in System Setup 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 RIMM in socket A. To troubleshoot system memory, perform the following steps: 1. Turn on the system, including any attached peripherals. CAUTION: Before you remove the computer cover, see "Safety First-For You and Your Computer." 2. If an error message indicates invalid system configuration information, enter System Setup and check the System Memory option. If the amount of memory displayed does not match the amount of memory installed, turn off the computer, disconnect it from the electrical outlet, remove the computer cover, remove the AGP card brace, and reseat the RIMMs in their sockets. 3. Replace the AGP card brace, replace the computer cover, reconnect the system to an electrical outlet, and turn it on. 4. If the problem is not resolved, start the Dell Diagnostics by inserting the Dell ResourceCD and rebooting the system. 5. Run the RAM test group. 6. 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 video card. Before attempting to troubleshoot the video subsystem, perform the procedure found in "Troubleshooting the Monitor" to determine whether or not 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