Lenovo V490u Laptop User Guide - Lenovo V490u - Page 49

When using a high power consumption external devices such as an external USB optical drive, use

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2. Also make sure that the device from which the computer starts is enabled. Under the Start ➙ Boot menu, make sure that the device is included in the Boot Priority Order list. 3. Press F12 when the Lenovo logo appears on the screen while the computer is starting up to select the device you want the computer starts from. The connected external device does not work. Make sure that: • Do not connect or disconnect any external device cables other than USB cables while the computer is turned on; otherwise, you might damage your computer. • When using a high power consumption external devices such as an external USB optical drive, use external device power adapter. Otherwise, the device may not be recognized, or the system might be turned off. For more technical support, please go to http://www.lenovo.com/support Chapter 8. Troubleshooting computer problems 37

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2. Also make sure that the device from which the computer starts is enabled. Under the
Start
➙
Boot
menu, make sure that the device is included in the
Boot Priority Order
list.
3. Press F12 when the Lenovo logo appears on the screen while the computer is starting up to select
the device you want the computer starts from.
The connected external device does not work.
Make sure that:
•
Do not connect or disconnect any external device cables other than USB cables while the computer is
turned on; otherwise, you might damage your computer.
•
When using a high power consumption external devices such as an external USB optical drive, use
external device power adapter. Otherwise, the device may not be recognized, or the system might be
turned off.
For more technical support, please go to
Chapter 8
.
Troubleshooting computer problems
37