Installed a 600W Power supply and AMD HD 7850 into an Acer Aspire M3970-UR10P. The video would not initialize, tried plugging into all both video ports (DVI-I) and then plugged into onboard VGA port and didn't show there either. After removing the card, system started normal with onboard video. Tested card in another older system w/ PCI-E, card posted and video switched properly.
Not sure what to do next. Any help is appreciated.