I'm building a new PC. The problem is I have no OS on my PC yet and I have it connected to my TV via VGA and I am getting no signal. I have a MSI Z97s krait edition and a r9 270x gpu. I have the VGA connected to the mobo not the gpu. Do I need an actual monitor until I get an OS on it? My tv is an older Vizio and I'm using a bootable thumb drive with Ubuntu on it for my OS.