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How to Troubleshoot Unpredictable Symptoms
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Hardware, driver, and disk problems can cause unpredictable symptoms when Windows is running, including:
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Failing applications and services Stop errors System resets Accessories that behave unreliably
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Many different types of problems can cause these symptoms . To identify the source of these problems and possibly fix the issue, follow these steps . After each step, determine whether the problem continues .
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If Windows will not start, see 29 . Use Reliability Monitor to determine how long the problem has been occurring and what other related symptoms might be occurring . For more information, read the section titled How to Use Reliability Monitor later in this chapter . Then use Event Viewer to find any related events that might provide useful information for diagnosing the problem . Typically, drivers will add events to the System Event Log . However, drivers
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Troubleshooting Hardware, Driver, and Disk Issues
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could add events to any log . For information about using Event Viewer, see the section titled How to Use Event Viewer later in this chapter .
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Install any updates available from Windows Update . For more information, see 23 . Install updated drivers available directly from the hardware manufacturer, including BIOS and firmware updates for all hardware accessories and your computer . Roll back any recently updated drivers . For more information, see the section titled How to Roll Back Drivers later in this chapter . Troubleshoot disk problems by using ChkDsk to identify and possibly fix disk-related problems . To resolve problems related to low free disk space, run the Disk Cleanup Wizard . For more information, see the section titled How to Troubleshoot Disk Problems later in this chapter . Test your memory for problems by using Windows Memory Diagnostics . For more information, see the section titled How to Use Windows Memory Diagnostics later in this chapter . Remove unnecessary hardware features one by one . If the problem disappears after removing a hardware feature, that feature likely is causing the problem . Continue troubleshooting that specific feature by following the steps listed in the section titled How to Troubleshoot Problems with Existing Hardware earlier in this chapter . Perform a system restore to attempt to return the computer to the latest state when it was functioning correctly . To use System Restore, see the section titled How to Use System Restore later in this chapter . Contact your computer manufacturer for support . You might have a hardware or software failure, and your computer manufacturer can assist with additional troubleshooting .
How to Diagnose Hardware Problems
Always remember to check basic issues before attempting to remove and replace parts . Before installing new peripherals, refer to your motherboard and device manuals for helpful information, including safety precautions, firmware configuration, and expansion slot or memory slot locations . Some peripheral manufacturers recommend that you use a busmastering PCI slot and advise that installing their adapter in a secondary slot might cause it to function improperly .
How to Use Device Manager to Identify Failed Devices
Windows 7 can detect hardware that is not working properly . View failed hardware by following these steps to use Windows Device Manager:
Click Start, right-click Computer, and then select Manage .
How to Diagnose Hardware Problems
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Under System Tools, click Device Manager . Device Manager displays all devices . Problem devices (including any devices with which Windows 7 is unable to successfully communicate) are displayed with a warning sign . If no categories are expanded and no devices are visible, Windows did not detect a problem with any device .
How to Check the physical Setup of Your Computer
If you have recently opened the computer case or the computer has been moved or shipped, connectors may have loosened . You should perform the following tasks to verify that connections are solid:
Confirm that the power cords for all devices are firmly plugged in and that the computer power supply meets hardware specifications Computer power supplies are available in different sizes and are typically rated between 200 and 400 watts . Installing too many devices into a computer with an inadequate amount of power can cause reliability problems or even damage the power supply . See the manufacturer s power specifications when installing new devices and verify that your computer can handle the increased electrical load . Disconnect external accessories External accessories such as those that connect using USB or IEEE 1394, PC cards, and ExpressCards can malfunction and interfere with the startup process . You can identify the cause of the problem either by disconnecting devices one by one and attempting to start the computer after disconnecting each device or by disconnecting all the devices, restarting the computer, and then reconnecting the devices one by one . Verify that you correctly installed and firmly seated all internal adapters Peripherals such as keyboards and video cards often must be installed and functioning to complete the initial startup phase without generating error messages . Adapters might become loose if the computer is moved or bumped or if the computer vibrates from moving parts such as hard disks . Verify that you correctly attached cables Check that you have firmly seated all cable connectors by disconnecting and reconnecting cables . Search for damaged or worn cables and replace them as required . To ensure that contacts are solid, use a pencil eraser to clean dirty connectors . Check the system temperature High temperatures inside a computer can cause unpredictable failures . Many computers will display internal temperatures for the processor, hard disk, graphics card, or other features if you start the Firmware menu . Graphical third-party tools also run within Windows for displaying temperature diagnostic information . If the temperature is high, verify that all fans are working properly and the vents are not blocked . Verify that the computer s case is completely assembled . Leaving panels open might seem like it would improve airflow, but it can actually misdirect air that should be cooling hot features . Verify that air can flow freely around the
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