I have my AIR plugged into another monitor and after it goes to sleep sometimes it sounds like the system is running and it will not come back up..  I have to restart it.   What is this..  Please help

I have a macbook air and i have it hooked to another monitor and I love it but lately it has after it goes to sleep for a while it sounds like it is trying to run the drive or fan really hard and when I try to bring it alive it does not come back to life so I have to hard boot it and then restart it.   What is this...

Go into Sys. Pref , and power settings and UNcheck "put hard disks to sleep" on both power tab and battery tab.
When on projector use with your Air and a presentation, dont close the monitor or sleep your Air.
Verify any coincident applications running that can/could conflict with projector / sleep occurrence by running Etrecheck:
report back on same
http://www.etresoft.com/etrecheck
EtreCheck is a simple little app to display the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support Communities to help people help you with your Mac. EtreCheck automatically removes any personally identifiable information from the output.

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