Sounds like you may have an app or utility that conflicts with Yosemite. Try holding the shift key when booting to get to safe mode. That bypasses any login or startup items and will eliminate that as the cause.
If the BBs go away in safe mode, use Etrecheck to ID everything running and start removing things to find the offender.
Sounds like you may have an app or utility that conflicts with Yosemite. Try holding the shift key when booting to get to safe mode. That bypasses any login or startup items and will eliminate that as the cause.
If the BBs go away in safe mode, use Etrecheck to ID everything running and start removing things to find the offender.