Here it is trying to watch my computer on tv attached HDMI cable straight to tv from computer and even tried it through my dvd player when pressing source button on tv remote it just says no signal on everything. Is there anything I need to change on my computer for my tv to reconise cable all connections are ok even tried vga cables before this same problem. Im very new to this so could answers be in simple terms no computer jargon have 42" plasma tv and acer aspire windows vista computer.