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You can use Device Manager to examine the USB controllers and hubs in a computer, determine their power capabilities, and examine the power requirements of the connected devices . This can help you to identify the source of a USB problem . To examine USB devices, follow these steps:

1. 2. 3. 4. 5.

Click Start, right-click Computer, and then select Manage . In the Computer Management console, click Device Manager (under System Tools) . In the right pane, expand Universal Serial Bus Controllers . Right-click an instance of USB Root Hub (there might be several) and then click Properties . Click the Power tab, as shown in Figure 30-9 . This tab displays the power capabilities of the hub and the power requirements of every connected device . To determine the requirements of any specific device, disconnect the devices and connect them again one by one .

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Bluetooth is a wireless protocol for connecting accessories to computers . Bluetooth is commonly used to connect keyboards, mice, handheld devices, mobile phones, and global positioning system (GPS) receivers . Bluetooth is simple enough to configure that most users can connect Bluetooth devices without help from the Support Center . However, users may occasionally have problems initiating a Bluetooth connection . Other times, a connection that previously worked may stop working for no apparent reason . If you cannot successfully connect a Bluetooth device, try these troubleshooting steps:

1. 2.

Verify that the device is turned on and that the batteries are charged . Place the device within a few feet of your computer (but not too close to your Bluetooth adapter) . Additionally, verify that the device is not near other devices that use radio frequencies, such as microwave ovens, cordless phones, remote controls, or 802 .11 wireless networks . Verify that the device has Bluetooth enabled and that it is configured as discoverable . For security reasons, many devices are not discoverable by default . For more information, refer to the instructions that came with the device . Install any updates available from Windows Update . For more information, see 23 . Download and install updated software and drivers for your hardware . Hardware manufacturers often release updated software for hardware features after they release the hardware . You can typically download software updates from the manufacturer s Web site . Verify that Windows is configured to accept incoming Bluetooth connections . Verify that security is configured correctly . You might have configured a nondefault passkey for your device . By default, many devices use 0000 or 0001 as a passkey . Remove and reinstall the Bluetooth device .

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6. 7. 8.

The sections that follow describe free Microsoft tools that can be useful for advanced troubleshooting .

DiskView shows how files are physically laid out on your disk and allows you to view where specific files are stored . To run DiskView, save the file to a folder that is allowed to run executable files, such as C:\Program Files\ . Specifically, you cannot save it to a Temporary Files folder . Then, right-click DiskView .exe and click Run As Administrator . Click the Volume list and select

When the system boots, it checks the crash dump options configured by reading the registry value HKLM\SYSTEM\CurrentControlSet\Control\CrashControl. If a dump is configured, it makes a copy of the disk miniport driver used to write to the boot volume in memory and gives it the same name as the miniport with the word dump_ prefixed. It also checksums the components involved with writing a crash dump including the copied disk miniport driver, the I/O manager functions that write the dump, and the map of where the boot volume s paging file is on disk and saves the checksum. When KeBugCheckEx executes, it checksums the components again and compares the new checksum with that obtained at the boot. If there s not a match, it does not write a crash dump, because doing so would likely fail or corrupt the disk. Upon a successful checksum match, KeBugCheckEx writes the dump information directly to the sectors on disk occupied by the paging file, bypassing the file system driver and storage driver stack (which might be corrupted or even have caused the crash). Note Because the page file is created early in system startup during memory manager initialization, most crashes the are caused by bugs in system-start driver initialization result in a dump file. Crashes in early Windows boot components such as the HAL or the initialization of

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