So I've recently come to acquire a new graphics card seeing as my computer didn't have one. I bought the ASUS Geforce GTX 760 DirectCU II OC in specific and talked with some of my friends who dabble with computers and said it was good for mine. Now I'm running a Windows 7 HP p-7 1209 and needed more power so I went and got a new power supply, antec 620 watts. Took the old one out, new one in, powered up my tower, everything checked out. Powered down, put in the card, started up normally, or so I thought, then stopped at the hp logo screen, and stayed there about 2-4 minutes with beeps in intervals of about 20-30 seconds, 3 beeps. Then a blank screen with and underscore at the top-right flashing. While this is going on I cannot do anything, hit the f-keys, start up boot menu, nothing is responsive. I don't know what is wrong and I've tried everything that I seem to be able to find to no avail. If anyone could help me out much would be appreciated. I'm not to tech savvy so I don't know exactly what specs I should post that would help resolve my issue. That's all I've to say I guess for now, thanks in advance and have a good day!