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Figure 634
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Windows XP offers the nifty feature of rolling back to previous drivers after an installation or driver upgrade If you decide to live on the edge and install beta drivers for your video card, for example, and your system becomes frightfully unstable, you can back up to the drivers that worked before (Not that I ve ever had to use that feature, of course!) To access the rollback feature, simply open Device Manager and access the properties for the device you want to adjust On the Driver tab (Figure 635), you ll find the Roll Back Driver button
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Many PC enthusiasts try to squeeze every bit of performance out of their PC components, much like auto enthusiasts tinker with engine tunings to get a little extra horsepower out of their engines Expansion card manufacturers love enthusiasts, who often act as free testers for their unpolished drivers, known as beta drivers Beta drivers are fine for the most part, but they can sometimes cause amazing system instability never a good thing! If you use beta drivers, make sure you know how to uninstall or roll back to previous drivers
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Step 4: Verify
As a last step in the installation process, inspect the results of the installation and verify that the device works properly Immediately after installing, you should open Device Manager and verify that Windows sees the device (Figure 636) Assuming that Device Manager shows the device working properly, your next check is to put the device to work by making it do whatever it is supposed to do If you installed a printer, print something; if you installed a scanner, scan something If it works, you re done!
Figure 636
Device Manager shows the device working properly
IT Technician
Troubleshooting Expansion Cards
A properly installed expansion card rarely makes trouble it s the botched installations that produce headaches Chances are high that you ll have to troubleshoot an expansion card installation at some point, usually from an installation that you botched personally The first sign of an improperly installed card usually shows up the moment you first try to get that card to do whatever it s supposed to do and it doesn t do it When this happens, your primary troubleshooting process is a reinstallation after checking in with Device Manager Other chapters in this book cover specific hardware troubleshooting sound cards in 18, for example, and video cards in 17 Use this section as your general methodology to decide what to look for and how to deal with the problem
Device Manager
Device Manager provides the first diagnostic and troubleshooting tool in Windows After you install a new device, Device Manager gives you many clues if something has gone wrong Occasionally, Device Manager may not even show the new device If that happens, verify that you inserted the device properly and, if needed, that the device has power Run the Add/Remove Hardware Wizard and see if Windows recognizes the device If Device Manager doesn t recognize the device at this point, you have one of two problems: either the device is
Mike Meyers A+ Guide to Managing and Troubleshooting PCs
physically damaged and you must replace it, or the device is an onboard device, not a card, and is turned off in CMOS It s rare that Device Manager completely fails to see a device More commonly, device problems manifest themselves in Device Manager via error icons a black ! or a red X or a blue i
A black ! on a yellow circle indicates that a device is missing, that Windows does not recognize a device, or that there s a device driver problem A device may still work even while producing this error A red X indicates a disabled device (Figure 637) This usually points to a device that s been manually turned off, or a damaged device A device producing this error will not work A blue i on a white field indicates a device on which someone has configured the system resources manually This only occurs on non-ACPI systems This symbol merely provides information and does not indicate an error with the device
The ! symbol is the most common error symbol and usually the easiest to fix First, double-check the device s connections Second, try reinstalling the driver with the Update Driver button To get to the Update Driver button, right-click the desired device in Device Manager and select Properties In the Properties dialog box, select the Driver tab On the Driver tab, click the Update Driver button (Figure 638)
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