Installing SSD in 2008 iMac - Strange problem

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i have transcend 256gb ssd370 i've been trying run on imac

installed yosemite on , booted via usb hdd enclousre see if worked, did.

proceeded open imac , swap internal hd ssd, when powered worked.

however, after few minutes start umbrella , freeze, after restart took ages load up, when did started freeze , umbrella again.

refused boot ssd, , grey screen , nothing.

i've updated firmware latest , wiped , tried again, checked status on windows machine , worked fine.

not sure else try?
 



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