Howdy
I have a Gigabyte Z77X-D3H Motherboard with onboard graphics, 8 gb RAM, Intel i5-3550 CPU@ 3.3GHZ running W7 Home Premium connected to a 22" LCD on the DVI with 3.5mm audio  and a 40" LED through an Onkyo  TX-NR 609 in the lounge on the HDMI.
My problem is that I can only have the audio on the monitor or the 40" not both - so I'm thinking I may need to install a Video Card. Also when someone turns the receiver on or off the 22" goes blank momentarily 2 or 3 times - always at a bad time which also leads me to think Video Card.

Do I need one and if so which one?  No heavy gaming.  

Cheers
Alan