Removed my nvidia gt 630 drivers and card and put in nvidia gefore gtx 770. After doing so the acer screen comes up and 3 short beeps spaced out. Then it is a black screen with a flashing _ .Tried reseating both the ram and the card. Out of ideas. Please help. I have enough power, ram, hard drive space etc.
Try reseting bios by removing batery from motherboard for 30 sec. And try boot with that old gt630, if it works install drivers for gtx 770, put gtx 770 back a try boot. And make sure in another computer that gtx 770 is not bad.