My iMac not starting/logging after yosemite upgrade

After my yosemite upgrade, got a problem starting up and logging up my iMac. Applecare advisers seems not able to help after all checks have been done. Now i have a 8month old iMac idle. Please help

Hi,
In addition to Linc's suggestion can you check the Apple Icon Menu top left and the "About this Mac" pane ?
In the Overview tab the last thing in the list of items is the Mac's Serial number.
Does this show up for you ?
You do not have to post the Number and if you use a Pic alter it to be unreadable in a Graphics app first.
8:26 pm Monday; November 17, 2014
 iMac 2.5Ghz i5 2011 (Mavericks 10.9)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad

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AT,rmid=0,flags=0x0
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AT,rmid=0,flags=0x0
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