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Chapter 5. TroubleshootingOther problemsYour computer does notrespond.The computer does not startfrom a device you want.The connected external devicedoes not work.• To turn off your computer, press and hold the power buttonfor 4 seconds or more. If the computer still does not respond,remove the AC adapter and the battery.• Your computer might lock when it enters sleep modeduring a communication operation. Disable the sleep timerwhen you are working on the network.• See the Boot menu of the BIOS setup utility. Make sure thatthe Boot priority order in the BIOS setup utility is set so thatthe computer starts from the device you want.• Also make sure that the device from which the computerstarts is enabled. In the Boot menu in the BIOS setup utility,make sure that the device is included in the Boot priorityorder list.• Press F12 when the Lenovo logo appears on the screenwhile the computer is starting up to select the device youwant the computer starts from.• Do not connect or disconnect any external device cablesother than USB while the computer power is on; otherwise,you might damage your computer.• When using a high power consumption external devicessuch as an external USB optical disk drive, use externaldevice power adapter. Otherwise, the device may not berecognized, or system shut down may result.38
Appendix A. CRU instructionsNote:The illustrations used in this chapter are of the Lenovo IdeaPad Z480, unless otherwise stated.Replacing the battery pack - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -Note: Use only the battery provided by Lenovo. Any other battery could ignite or explode.To replace the battery pack, do the following:1 Turn off the computer, or enter hibernation mode. Disconnect the ACadapter and all cables from the computer.2 Close the computer display, and turn the computer over.3 Unlock the manual battery latch a. Holding the spring-loaded batterylatch in the unlocked position b, remove the battery pack in the directionshown by the arrow c.14 Install a fully charged battery pack.5 Slide the manual battery latch to the locked position.6 Turn the computer over and reconnect the AC adapter.39
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Page 57: TrademarksThe following terms are t

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