Lenovo S400U, 59RF0035 manual Troubleshooting Other problems, Respond

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Chapter 6. Troubleshooting

Other problems

Your computer does not	• To turn off your computer, press and hold the power
respond.	button for 4 seconds or more. If the computer still
	does not respond, remove the AC adapter.
	• Your computer might lock when it enters sleep mode
	during a communication operation. Disable the sleep
	timer when you are working on the network.

The computer does not start from a device you want.

The connected external device does not work.

•See the Boot menu of the BIOS setup utility. Make sure that the UEFI in the BIOS setup utility is set so that the computer starts from the device you want.

•Also make sure that the device from which the computer starts is enabled. In the Boot menu in the BIOS setup utility, make sure that the device is included in the UEFI list.

•While powered-off, press Novo button to select the device you want the computer starts from.

•Do not connect or disconnect any external device cables other than USB while the computer power is on; otherwise, you might damage your computer.

•When using a high power consumption external devices such as an external USB optical disk drive, use external device power adapter. Otherwise, the device may not be recognized, or system shut down may result.

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Contents Lenovo IdeaPad S300/S400/S400u/S405 Regulatory Notice Second Edition August Copyright Lenovo Contents Page Getting to know your computer Top viewGetting to know your computer Integrated TouchpadRJ-45 port Left-side viewFan louvers Hdmi portRight-side view JackUSB 2.0 port Front view Bottom view „ Reading the manuals „ Connecting to the powerLearning the basics „ Turning on the computer„ Checking battery status „ Charging the battery„ Removing the battery pack „ Handling the battery Using the touchpad Left-click areaRight-click area Hotkeys „ Setting hotkey mode Inserting a memory card „ Using memory cards not suppliedConnecting external devices Removing a memory card„ Connecting USB devices „ Connecting Bluetooth enabled devices on select models Enabling Bluetooth communications on your computer„ Novo button a Special keys and buttonsSystem status indicators Power status indicator Battery status indicatorLearning the basics Symbol Indicator Meaning Status „ Using VeriFace Securing your computerConfiguring the operating system for the first time Starting to use WindowsStart screen Desktop Search charm Starting to use WindowsCharms Start charm Settings charmShare charm Devices charm„ Putting your computer to sleep „ Shutting down the computer Help and support Connecting to the Internet Wired connection„ Hardware connection Cable „ Software configuration Connecting to the InternetWireless connection Wi-Fi WiMAX„ Connecting to wireless LAN Enabling wireless connectionConnecting to a wireless network Lenovo OneKey Recovery system „ Backing up the system partition„ Restoring Frequently asked questions Troubleshooting„ Drivers and preinstalled software „ Finding information„ Lenovo OneKey Recovery system „ Bios setup utilityTroubleshooting When do I need to change the boot mode? „ Getting helpTroubleshooting Display problemsTroubleshooting Bios password problems Sleep problemsDisplay panel problems WorkTroubleshooting Sound problems Battery problemsHard disk drive problem Troubleshooting Other problems RespondTrademarks Page V2.0en-US