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MCSA/MCSE Self-Paced Training Kit (Exam 70-270): Installing ...

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6-21<br />

devices also can have their own power sources, if necessary. Many devices, such as digital<br />

cameras and scanners, draw more power than a USB hub can provide.<br />

<strong>Exam</strong> Tip Some USB hubs are self-powered, and some are not. Hubs that are not self-powered<br />

draw power from the hub to which they are connected or from the computer itself. If you<br />

find that a USB device that is connected to an unpowered USB hub is not working as<br />

expected, try replacing the unpowered USB hub with a self-powered hub.<br />

Because you can add nearly any type of peripheral device to the PC through the USB<br />

port, the range of symptoms that are associated with USB devices include all the symptoms<br />

that are listed for peripheral devices in this chapter. Problems that are associated<br />

specifically with the USB technology occur in the following general areas:<br />

■ USB hardware device<br />

■ USB controller<br />

■ USB drivers<br />

The first step in troubleshooting USB problems is to check the BIOS setup to make sure<br />

that the USB function is enabled for the computer. Table 6-5 describes basic USB troubleshooting<br />

procedures.<br />

Table 6-5 Basic USB Troubleshooting<br />

If This Happens Do This<br />

USB functionality is enabled<br />

in the BIOS.<br />

The controller does not<br />

appear in Device Manager,<br />

or a yellow warning icon<br />

appears next to the controller.<br />

The controller is present in<br />

Device Manager.<br />

The BIOS and controller<br />

settings appear to be correct.<br />

Lesson 2 Configuring and Troubleshooting Hardware Devices<br />

Check Device Manager to make sure that the USB controller<br />

appears there. In Windows XP, the USB controller should be<br />

listed under the Universal Serial Bus Controllers entry (using<br />

the default Devices By Type view in Device Manager).<br />

Contact the BIOS manufacturer for an updated copy of the<br />

BIOS because the computer’s BIOS might be outdated.<br />

Right-click the USB controller, and then select Properties. If<br />

there are any problems, a message should appear in the Device<br />

Status section on the General tab of the controller’s Properties<br />

dialog box.<br />

Check the USB port drivers next. USB ports are listed in Device<br />

Manager as USB Root Hubs. Right-click a USB Root Hub entry,<br />

and then select Properties. Use the Driver tab of the USB Root<br />

Hub Properties dialog box to update or roll back drivers, if<br />

necessary.

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