unknownofprob :
update the firmware for the monitor connection as that will rule out the 10%, if you have other cables and monitors try those or different outputs and inputs for the graphics card/monitor.
well i only have dvi-i and dvi-d inputs on the gpu, on the old one i have dvi and vga and my monitor is vga, so i bought an adapter and i've put it in dvi-i . When the shut downs started i bought a new adapter and it shut down again. So that's why i said 10% because it's really a low chance 2 adapters are broken. Also i updated to the newest driver for the current card, i think it's ccc 13.9, or 13.1 not sure, because i can't put the new card and install the newest existing, the pc shuts down before i do it, and if i do it on this card i get a blue screen and i have to restore the pc to previous state. Also i wanted to try it on some other pc's but i didn't find any and i bought it on the internet so i can't return it in the store, it was a new card. Also i have 1 year guarantee but i would like to try and fix the problem, not return it...