27" iMac freezes

i work @ retail store , apple certified reseller. such, have floor demos of current models. funny thing, we've not yet received functional 27" 2011 imac demo. we've gone through 2 dead-on-arrival units, both experiencing same issue. once loaded, not connect local wifi network, , after anywhere 10 seconds 20 minutes freeze, locking entire computer until hard reset performed. each had issues connecting network every other demo have ever had has connected to, , each continued freeze, consistenly, after hard drive wipe , os re-install. has experienced this? first call made applecare took solid hour after os re-install confirmed doa, second model took 10 minutes, tops. because it's getting more common or i'm better @ explaining why computer won't work second time? second 1 had grey screen power icon pop said hard reset required in several languages, may have helped case.. 1 of dozen times locked on me..

 

are 2011 3.4ghz i7?
of them have ssds?

27" 2011 256gb ssd + 2tb 3.4ghz did hard freeze (non kernel panic) twice today.
i've speculated either ssd locking known issue.
or i7 cpu itself, seems 27" i7-2600 3.4ghz seems 2 variables determine might issues 2 newest types of hardware , people see online freezing/crashing issues.

consult authorized repair center , pretty agreed 2 components problem. ram fine.

im little weary of new devices.

 

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