Lenovo IdeaPad Y430 User Manual page 71

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.
See the Boot menu of the BIOS Setup Utility. Make sure that the startup
sequence 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 "Boot priority order" list.
Chapter 4. Troubleshooting
62