I would start with an SMC reset - May not work for sure, but an easy thing to try and has solved issues for my in the past.
http://osxdaily.com/2010/03/24/when-and-how-to-reset-your-mac-system-management-controller-smc/
NVRAM reset would be another thing to try if that doesn't do it
Best of luck we all know that it can be frustrating
Greg
http://osxdaily.com/2010/03/24/when-and-how-to-reset-your-mac-system-management-controller-smc/
NVRAM reset would be another thing to try if that doesn't do it
Best of luck we all know that it can be frustrating
Greg