Something same case, i bought from pcdepot agp 512mb 128bit card model forgot,
i use about 2 month it went blank all, so i claim 1to1 with them,
2nd time after change new unit, the gc when playh rakion it will show artifacts,white or pink line always crash.....
other game ok not much game i play,
my old 9250 128mb doesnt make this artifact on rakion..

after a while on and off it ok back,maybe it got ,heat prob etc, small defect,

same to card reader tinytech i boght from them,
i test laptop new and desktop cannot run ,starting run ok halfway it hang,
the small chinesee almost bald technician claim ok,use his laptop, i ask him use other pc he refuse,
2d time prob again i come to him ,still use same laptop ok.

but finally i went to carrefour bought card reader same type but different brand,
finally i swap usb cable for the pcdepot 's card reader, i only knew is cable problem ,
i failed to claim from them, but finally i prove that it is defect myself............................
long time adi , i swap cable cat prove also,since cable if i brnig both they will say i try change faulty 1 to them..........