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I suspect my video hard might be defective and I would like to turn it off and let the computer run without so I can see if the system still freezes. I have a Z68 board, how do I enable the 2500k's video?
Nope it is really easy to switch back and forth between the dedicated and the IGP. Also it is possible to run both at the same time at least with the Intel® Desktop Board DZ68DB and I would expect other Z68 boards to give you support for 3 or monitors.
Go into bios and make sure that you tell the computer you want it to enable integrated or IGP as the boot video device, not PCI-E add on card or whatever might be in your options.
also try taking out your current card, most mobo's will disable the igp when an external card is detected, of course you could just disable this in the bios. if the card is bad no reason to have it in there taking up power.