2012 27" iMac Unresponsive data bus


i have looked around , don't find same issue. don't want bore of details after time of owning new 27" 2012 imac internal hdd got flaky , died. every mac have ever owned had hdd die ready. have been running of externals forever , have boot drive cloned on weekly basis , rotate them monthly. latest problem drives take forever show @ boot whether or not set boot default or selecting on after post. once computer boot goes off weeds , can never awaken. when happens screen come on black never password prompt. can go far disconnecting drives without screen going blank. before pig became unusable tried of pram, nvram tricks , fiddled hibernation settings problem got worse. problem affects connected data bus; mouse, firewire, usb (don't have thunderbolt have adapter connected firewire 800 lacie external). know i'm going have take pig apple , fleeced , lied when want repaired. i'm curious if else has experienced total loss of connectivity of machine. until figured out happily plunk along on 4 year old i5 e6500 series dell running windows 8.1.

feedback appreciated.

 



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