dell xps 8900 video card

i have a knocking noise when i start the computer ,also the quick launch icons blink several times,i ran the video card test it show that it failed,video card works for all other things (pictures-  and other graphics ) running win 10 latest version ---I 7 6700 cpu and 16gb ram,I only had this computer for 4 months ,i hesitate to call dell support ,called them several times spent hours  with them ,and they cut me OFF.I am to a point that i will buy a new video card ,what i have now NVIDIA gtx730,i dont do games,my grand son sometimes plays games,.What would be a good for  about $100  Thanks----this is a xps 8900