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manual abstract
. The 2.4 GHz radio frequency used by Bluetooth and wireless LAN devices is also used by other devices. Bluetooth devices incorporate technology that minimizes interference from other devices using the same wavelength, however, communication speed and connection range may be reduced. Interference from other devices may also stop communication altogether. . Connection availability is affected by distance and obstructions. You may need to move your computer away from obstructions or closer to the device to which it is connected. . Identify and remove obstacles between your computer and the device to which it is connected. . Note that due to limitations of the Bluetooth standard, large files may occasionally be corrupted during continuous transfer due to electromagnetic interference from the environment. Why does the message requesting authentication appear? The target Bluetooth-enabled device is requesting connection authentication. Mutual authentication is required to enable Bluetooth communications with this device. Why can't I connect to service supported by the target Bluetooth device? Connection is only possible for services also supported by the computer with the Bluetooth functionality. For more details, see the help file on the Bluetooth utility software. 202202nN Troubleshooting Can I use a device with Bluetooth technology on airplanes? With Bluetooth technology, your computer transmits a radio frequency of 2.4 GHz. Sensitive locations, such as hospitals and airplanes, may have restrictions on use of Bluetooth devices, due to radio interference. Check with facility staff to see if use of the Bluetooth functionality on the computer is permitted. Why can't I connect to a Bluetooth device by specifying its IP address on a Personal Area Network (PAN)? The Bluetooth utility software uses Dynamic Host Configuration Protocol (DHCP) to assign IP addresses to active wireless devices. If you specify a fixed IP address for the device to which you want to connect, the utility cannot assign a dynamic IP address to the device and fails. Do not specify IP addresses when using a PAN. Why can't I use the Bluetooth functionality when I log onto my computer as a user with a standard user account? The Bluetooth functionality may not be available to a user with a standard user account on your computer. Log onto the computer as a user with administrator rights. Why can't I connect to a Bluetooth device in Personal Area Network User mode? If the device to which you want to connect supports Bluetooth communication in Personal Area Network User mode only, you cannot establish a connection from your computer. Why can't I use the Bluetooth utility software when I switch a user? If you switch a user without logging off from your system, the Bluetooth utility software will not work successfully. Make sure to log off before switching a user. To log off from your system, click Start, the arrow next to the Lock button, and Log Off. 203203nN Troubleshooting Optical Discs Why does my computer freeze when I try to read a disc? The disc that your computer is trying to read may be dirty or damaged. Follow these steps: 1 Restart the computer by clicking Start, the arrow next to the Lock button, and Restart. 2 Eject the disc from the optical disc drive. 3 Examine the disc for dirt or damage. If the disc is dirty, see On Handling Discs (page 173) for instructions on how to clean it. What should I do if the drive tray does not open? . Make sure your computer is on. . Press the drive eject button. . If the drive eject button does not work, click Start and Computer. Right-click the optical disc drive icon, and select Eject from the shortcut menu. . If none of the above options work, insert a thin, straight object (such as a paper clip) in the manual eject hole near the drive eject button. . Try restarting your computer. 204204nN Troubleshooting What should I do if I cannot play a disc properly on my computer? . Make sure the disc is inserted into the optical disc drive with the label facing upward. . Make sure the necessary program(s) is installed according to the manufacturer's instructions. . If a disc is dirty or damaged, your computer will stop responding. Follow these steps: 1 Press the Ctrl+Alt+Delete keys and click the arrow next to the Shut down button and Restart to restart the computer. 2 Remove the disc from the optical disc drive. 3 Check the disc for dirt or damage. If you need to clean the disc, see On Handling Discs (page 173) for instructions. . If you are playing a disc and cannot hear sound, do any of the following: . Right-click the volume icon on the taskbar and click Open Volume Mixer to check the settings. . Check the volume setting in the audio mixer. . If you are using external speakers, check the volume settings on the speakers and the connections between the speakers and your computer. . Make sure the correct driver software is installed. Follow these steps: 1 Click Start and Control Panel. 2 Click System and Mainten...
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