Checking Inside the Computer 7-15high-resolution video expansion card installed, whichoverrides the video logic of the computer.The following procedure troubleshoots problems with thevideo memory and video logic only. Before you begin,perform the procedure found in “Troubleshooting theMonitor” in Chapter 6 to determine whether the monitoris the source of the problem.If you have a high-resolution video expansion card, firstcomplete the steps in “Troubleshooting ExpansionCards” earlier in this chapter to verify that the card isconfigured and installed correctly.Follow these steps to troubleshoot the video subsystem:1. Run the Video Test Group in the systemdiagnostics.See Chapter 5, “Running the System Diagnostics.”Most of the tests in the Video Test Group are inter-active; that is, you must respond before thediagnostics continues with the next test.Do the tests complete successfully?Yes. It is not a video hardware problem. Go to Chap-ter 4, “Finding Software Solutions.”No. Continue to step 2.2. Turn off the system, including any attachedperipherals, and disconnect all the AC powercables from their power sources.3. Remove the left computer cover.See “Removing the Computer Covers” earlier in thischapter.4. Determine whether a video expansion card isinstalled.Is a video expansion card installed?Yes. Continue to step 5.No. The built-in video controller is faulty. Go tostep 6.5. Remove the video expansion card, and repeatstep 1.Do the tests complete successfully?Yes. The video expansion card is faulty. See Chap-ter 11, “Getting Help,” for instructions on obtainingtechnical assistance.No. Continue to step 6.6. See Chapter 11, “Getting Help,” for instructionson obtaining technical assistance.Troubleshooting the SystemBoardA system board problem can result from a defective sys-tem board component, a faulty power supply, or adefective component connected to the system board. If anerror message indicates a system board problem, followthese steps to find the problem:1. Turn off the system, including any attachedperipherals, and disconnect all the AC powercables from their power sources.2. Remove the left computer cover.See “Removing the Computer Covers” earlier in thischapter.3. Remove all expansion cards except the hard-diskdrive controller card and the video expansioncard (if they are installed).4. Replace the left computer cover, reconnect thesystem to AC power, and turn it on.5. For any EISA and ISA expansion cards, start thesystem configuration utility, and update the con-figuration information.See Chapter 5, “Using the System ConfigurationUtility,” in the system User’s Guide for instructions.CAUTION: See “Protecting Against Electro-static Discharge” in the safety instructions atthe front of this guide.CAUTION: See “Protecting Against Electro-static Discharge” in the safety instructions atthe front of this guide.
