First of all, we would need to troubleshoot the system without the video card, to check if the problem is related to a defective motherboard.
- So please test the system out of the chassis, with minimum configuration (motherboard, processor, 1 memory stick and power supply) no video card.
-Remove the CMOS battery and leave the system without it for about an hour. Then put it back on and restart the system. http://www.intel.com/support/motherboards/desktop/sb/CS-028780.htm?wapkw=clear+cmos+battery#datetime
-You may need to check if there is any new BIOS version available so you can flash it on the motherboard.
- Once you test the system using the onboard video, please include the video card on the PCI-e. I also recommend you to update the firmware of it.
-If the issue persisted, try using another video card/ wirelesscard/ etc in order to discard a defective PCI-e.
-If the issue persist and if the motherboard is still under warranty please get in touch with our Warranty Department so they can help you to replace the unit: http://www.intel.com/p/en_US/support/contactsupport