Is there any budget requirement for this Motherboard? An HDMI out Micro ATX board is usually $60~, but I think I met your requirements.
Also, since you have a little older chip, is it okay to assume the RAM Memory you are using is DDR2? If so, I got this trusted XFX brand motherboard for you.XFX MI93007
Let's see if I met the requirements!
Must be:Intel LGA 775 Socket
: Check!On-Board Graphics
: Check! NVIDIA GeForce 9300HDMI out
: Check!Micro ATX
Sweet. I think I did it! If you prefer a motherboard with DDR3 RAM Memory or something cheaper, let me know. There are some decent Foxconn and EliteGroup for $60~.