I've been working on this board for a long time and the 2 beeps on startup are normal. You don't have to worry about anything.
The only time that the parity beeps come it's in a quick sequence, there's really no pause inbetween the tones.
The graphics card issue is probably just in your bios, just have to change it over to exclusively use the onboard video or the graphics card. I believe the default is set for auto and that might not be best for your configuration.
Re item 3):
This motherboard uses the H55 chipset. My understanding is that this chipset is designed to work with processors that have the Intel graphics processor built onto the CPU chip itself, ie "on die." Examples include i3-540 and i5-6xx CPUs. The i5-760 is NOT one of these CPUs. Therefore, this motherboard/CPU combination cannot access built-in Intel graphics; it can ONLY use the graphics processor from a separate video card.