GPU Failure ??? R9 M290X

i have a AW17 R1 (im assuming its a r1 build date of febuary 8 2014 has the 4 ram slots) with the R9 M290X and i suspect the GPU has failed but im not positive what would the symptoms be .. i was playing fallout new Vegas and the screen squared up and the computer froze couldnt even get the take manager up so i did a hard reset now any time i switch to the dedicated card or do anything graphic intensive even video the screen goes black and i have to restart the computer ... iv tried new drivers but no luck iv also tried re seating the card .. anyone have any other thoughts or should i just replace the card
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