zxing barcode scanner example c# Troubleshooting Expansion Cards in Software

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Troubleshooting Expansion Cards
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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
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Device Manager shows the device working properly
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CHAPTER 10 Adapter Cards and Peripherals
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The 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 the Device Manager doesn t recognize the device at this point, you have one of two problems: either the device is 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 the Device Manager via error icons a black ! or a red X or a blue i
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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 1025) This usually points to a device that s been manually turned off or a damaged device A device producing this error will not work
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An X in Device Manager, indicating a problem with the selected device
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A blue i on a white field indicates a device on which someone has configured the system resources manually This occurs only 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 is 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 the Device Manager and select Properties In the Properties dialog box, select the Driver tab On the Driver tab, click the Update Driver button to launch the Hardware Update Wizard (Figure 1026) A red X error strikes fear into most technicians If you see one, first check that the device isn t disabled Right-click the device and select Enable If that doesn t work (it often will not), try rolling back the driver (if you updated the driver) or uninstalling (if it s a new install) Shut down the system and make triple-sure you have the card physically installed Then redo the entire driver installation procedure, making sure you have the most current driver for that device If none of these procedures works, return the card it s almost certainly bad
FIGURE 1026
Updating the driver
CHAPTER 10 Adapter Cards and Peripherals
As you look at the errors in Device Manager, you ll notice error codes for the device that does not work properly Windows has about 20 error codes, but the fixes still boil down to the same methods just shown If you really want to frustrate yourself, try the Troubleshooter It starts most fixes the same way by reinstalling the device driver
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Output Devices
utput devices enable you to see or hear feedback from the computer You ve done your input; the computer processes that information and then provides output Output devices come in three main categories: sound, video, and hard copy Printing gets its own chapter, so this section concentrates on sound and video
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