i got the ENGTS250 1G DARK KNIGHT Graphics card it is a PCi-E 2.0 but my old Graphic card was PCi-express will the dark kinght graphic card go in my pc
PCI-E 2.0 cards do work in original PCI-E slots. Technically the older slot could bottleneck your card, but I doubt you would notice any difference in performance.
try re-insert the card.make sure the card are properly inserted and the 6 pin power connector are connected to the card. if the 6 pin power connector are not properly inserted you may unable to boot up your pc