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The keyboard s drivers and resources are typically controlled by the BIOS When you install a USB keyboard, the BIOS must be informed so that it will hand control of the keyboard to the USB system Enter the CMOS settings at startup and ensure that the USB keyboard option is turned on If this option doesn t exist and you still want to use the USB keyboard, you might need to upgrade the BIOS or the computer The BIOS usually provides a generic drive for USB keyboards If the system you are using has an older BIOS, the driver may not be included
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USB Device Is Unknown Message, or the Device Won t Work
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A message stating that the USB device is unknown or the device simply won t work means the computer cannot communicate with the device First, make sure that the device is properly attached and is receiving power, and try switching it to another port Make sure that the device s cable is not longer than 5 meters Although most USB devices are Plug and Play, a few require proprietary drivers Make sure that a driver is loaded for this device Check to make sure that the device is using the proper communications mode On startup, the USB controller assigns an ID to all devices and asks them which type of data transfer (interrupt, bulk, or continuous) they will use If a device is set to use the wrong type of transfer mode, it will not work Finally, check the device by swapping it with a known good one
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If none of the USB devices work, you could have a problem with the entire system or the USB controller First, make sure that your OS is USB compliant, such as Windows 98, Windows Me, Windows 2000, or Windows XP Next, make sure that the number of devices does not exceed 127 and that no single cable length exceeds 5 meters The USB system is also limited to five tiers or five hubs in a single chain Check the cable length and cable connections, especially from the root hub to the first external hubs A loose connection will prevent all devices on the external hub from functioning If the problem isn t in the USB physical setup, turn your attention to the USB controller Make sure that a proper driver has been loaded for it and that it does not have an IRQ or I/O conflict with another device You should also check the BIOS for USB support, to determine if you can use USB in this system You may also want to uninstall the driver for the USB hub or controller When you restart the system, the operating system will notify you to reinstall these drivers This may fix the problem
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Problems stemming from the CMOS include lost or incorrect settings Lost settings occur when the CMOS battery begins to lose power You will generally be informed of this problem by a 1** error message at startup or by a prompt to enter the correct time and date When this is the case, replace the battery Incorrect CMOS settings can have many incarnations because there are CMOS settings for a great variety of system elements, including hard drives, floppy drives, the boot sequence, keyboard status, and parallel port settings The incorrect setting will be manifested as an error relating to that particular device or function, so it can be difficult to pinpoint the CMOS as the source of the problem However, when you need to change or update the CMOS, enter the CMOS settings at startup, make the appropriate change(s), save the new setting(s), and restart the computer
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