ok i got my 24 inch tft monitor and asus ati 5870 but now i have a problem blackarrow

ye like tittle say i installed my 5870 i got a crash now i see a black slash or arrow above my screen in the bar when you have google open or this site or a game i see a big black arrow slash in my screen its only above not down ive readed alot of people have that problem with ati i never had it befor with my 4890 now even with my 4890 and old tft i have it im plenning on sending the card and tft back to the store then they wil fix it or can i fix it my self ive readed on google that alot of people have this problem but i had it never befor when i had the ati 4890 i hope some one can help me

 

it is all correclty i bough a complete system that i wanted its 600w plus evrything is made by the supplier self not by me i know evrything is good because befor that card i had no issues befor i had the 4890

 

because ive tryed the tft at my sisthers pc and even she have the black arrow i dont know what to do im thinking of sending it back and let them see where the problem iss

 

wel why is it that i have the same problem with my old 22 inch tft and old 4890 at i never had that to maybe its the mainboard?