Hi There and Welcome to Fixya!
Another way to turn on the wireless radio on your Lenovo Y510 is to press and hold the "Fn" key, then simultaneously press the "F5" key.
This is an alternative way to switch the wireless antenna on or off without using the physical WIFI switch.
Hope this helps,
Thank you for using FixYa.
You may also want to check in Windows' Netwotk and Sharing Center / Change adapter settings. This view will show if your wireless adapter is enabled or disabled. If necessary, right-click on the wireless adapter icon and select Enable.
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