I have issues with either my new PC or graphics card.. i have an hp pavilion p7-1439 with an integrated graphics chip. i bought a geforce gtx 660 gaming editon but when i install it my PC turns on but the boot up wont hapopen. the screen says no signal. idk whats goin on and this is my first time doing this. I NEED HELP! EDIT: i did upgrade my power supply to 600 wats so power cant be the issue.