My mac mini has been back from the Genius Bar for 8 days.
They replaced the logic board again. 2nd replacement in a month.
They also replaced the cooling fan and a burnt/melted screw.
The first morning after it got back it would not wake from sleep. 4 other times throughout the day it would not wake from sleep. All after a clean install of Mavericks... again. 2nd time for a fresh install in 30 days period.
I wanted to reply to AW1960's post regarding AVIRA. I HAD it installed also, but that was prior to the two clean installs of Mavericks. 1st one was January 3, 2014. 2nd one was January 20 or so. I just got it back from the store on February 8, 2014. They were troubleshooting it for about 16 days.
I still had the wake from sleep problem with NO software installed except for Mavericks after the first visit to the store. I did not reinstall AVIRA and still had wake from sleep issues.
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Since I have a 3 year old grand daughter who uses the mac while I'm at work for her educational games, I MUST have a computer that will wake from sleep. She is one reason for the Mac and the educational software benefits it has.
Sooo. I also have a 120 GB SSD that I got for Christmas and still had not installed because I was trying to resolve the wake from sleep issue first.
Here's my temporary solution to the problem.
I installed the new SSD. When I did, I installed OS X 10.8.5 from scratch via the internet. I have now reinstalled all of my apps EXCEPT AVIRA, which will never again be installed on this Mac! That includes MS Office 2011, FINALE (music writing program), several games (Angry Birds and company, several hidden object games), quite a few educational games for my 3 year old grand daughter, and a greaty little app called Loginox which allows you to change your logon screen.
I have been running Mountain Lion (10.8.5) for 9 days with ZERO failed wake from sleep atrempts! I still don't have the nerve or desire to retry Mavericks with the solid state drive. My computer is back to normal, actually way faster with the Samsung SSD 840 EVO 120GB.
Next step is to reinstall my 1 TB drive.