Entire iTunes library disappeared
I cannot sync my MacBook Air with other devices
MacBook Air
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What happens when you try? Error message(s)? Are you having WiFi problems? More information would help.
Wi-Fi routers and access points - Recommended settings for. *
What does Wireless Diagnostics show?
Wi-Fi Problems in OS X Yosemite
Wi-Fi Problems in OS X Yosemite (3)
WiFi Potential Temporary fix - Yosemite
Also try turning off Bluetooth.
If your Wi-Fi source is capable of generating a 5 GHz Wi-Fi network, try that to help avoid conflicts with Bluetooth.
Troubleshooting Wi-Fi issues in OS X
Wireless Connection Problems - Fix
Wireless Connection Problems - Fix (2)
Wireless Connection Problems - Fix (3)
