Lenovo S210 Laptop User Guide - IdeaPad S210, S210 Touch, S215, S500, S500 Tou - Page 33

Chapter 4. Troubleshooting Other problems Your computer does not respond. • To turn off your computer, press and hold the power button for 4 seconds or more. If the computer still does not respond, remove the battery pack and the AC power 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. I need to start the computer from a connected device, but the device does not appear on the boot device list. • Check the boot mode setting in the BIOS setup utility. If Boot Mode is set to UEFI, make sure that the device or the medium in the device supports UEFI boot. If the device or the medium in the device does not support UEFI boot, set Boot Mode to Legacy Support. If the device still does not appear in the boot device list, replace with a new device or medium. The connected external device does not work. • 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 device such as an external USB optical disk drive, use an external device power adapter. Otherwise, the device may not be recognized, or system shut down may result. 27