iMac 27" Late 09 shut down it self and restart! Shortcircuit?
Hi all, i've change video card of my imac (4670) with an 6670m. After one hour my imac shut down. Now when i want to power on, it turn on, no chime, black screen, and after 5 seconds shut down and restart itself (black screen, no chime sound). Without video card inserted, start and no shutdown, i hear sound chime but black screen (because not have gpu).
If i try to insert video card when it start without, and the imac shut down - Short circuit - . i've try 3 video card, but the symptoms is equal. Thanks all!