So I just built my first computer the other night. i5-7600k, Asus Tuf mobo, cryorig h7, yada yada. I don't have the video card yet, still saving up that little bit extra so I don't totally break the bank all at once. I've got everything hooked up and everything turns on. All fans, cooler, psu (obviously) are running great and I don't think I missed any cables, but I can't get the video to work. I plug in the HDMI from my mobo to the monitor and nothing happens, just no signal. Help?