If a sony blu ray player is set up at 1080p and is set up to a HDTV at 1080i will it play a blu ray disc with high definition sound and picture?

I have a sony bluray player conected to my tv by a hdmi cable only it wont work can anyone help me
Go into the menu and set the output resolution to either 720p or 1080i and it should work on any HDTV that's not 1080p. If it doesnt, don't use an HDMI cable - use Red/Green/Blue (Component Video) cables to hook up to the TV. It will work fine at 720p. You will also need to connect additional red and white cables for sound.