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iMac late 09 27" GPU shortcircuit HELP!

P

paulforce

macrumors newbie
Original poster
Nov 28, 2013
3
0
Hello everyone, I changed my gpu 4670 imac 27 2009 with 6670. imac after the few minutes it off by itself and now when I turn it on, start (black screen), it turns off after 5 seconds, and turn on again! Every GPU i insert in, The symptom are this. There is a short circuit on mxm connector? Please help! I've try all.
 
Without GPU inserted start (black screen) with sound chime, without shutdown. Tue GPU are not shortcircuit components.
 
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