It's my first time building a PC, I've put everything together and the pc starts up with all the fans going etc. However, when I try to boot up with my monitor (Asus VX228) I get "No Signal". I'm running an R7 265. The monitor only has 2 HDMI ports, 1 VGA port, an audio + headphones jack, and 1 port for the power. I have a DVI to HDMI cable ( DVI goes into GPU and HDMI goes into Monitor), I also have a VGA cable( GPU has no spot for VGA but comes with a VGA to DVI). I've tried both of those, and even both at once, and still no luck. Please help