I took my old Sapphire HD 7870 and installed it into my new computer. Everything turns on including the fans on the video card, but it turns off after 3 seconds and reboots itself. I use the onboard vga for display and it works fine. Is the videocard broken? it worked on my old computer just fine.
Gigabyte z97-HD3 motherboard
i5 4670k cpu
16gb G.Skill RipJaw Ddr3 Ram
700w Coolermaster Silent Pro PSU