Apple Hardware Test won't finish - possible disk problem?

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apple hardware test won't complete. seems stop after 20 minutes. can still move mouse, it's jerky. time shown next "total time testing" has not updated in several hours.

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suspect there's issue hard drive. user tried install upgrade yosemite , failed error type of disk issue (sorry, don't have exact error, searching on error indicates disk problem). disk utility installation utility , mac attached via target disk mode reports no issues.

can't boot copy of disk warrior. screen stays white apple logo. might copy old i5 imac. super duper makes complete copy of disk device, can't find exact error right now.

hoping apple hardware test tell me answer, won't finish. i've run native test , used option - d download test.

hate open , replace drive see if makes difference. i'd better diagnosis. thoughts?
 

a follow prior post aht not completing. this post on apple's discussion forum describes symptoms i'm seeing t. poster turned out logic board. @ 1 point wasn't sure whether logic board or hard drive. i'm doing clean format , install , see if holds up.
 


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