best monitor configuration?

hi guys

i purchased a sapphire HD5750 the other day and on sunday morning the top of the screen began flickering.... however i changed the dvi connection to hdmi and after some head scratching ive managed to get it working ok

the flickering has gone which is a relief.. however now i have my card connected by HDMI what kind of options do i have ... for example

1) when watching movies

2) when playing pc games

to be honest i cant see much difference.... and that shows my lack of knowledge when it comes to hdmi....however i do notice there are hdtv options in the resolution options in the catylyst control center but everytime i try to set them the screen size reduces and i have a border around the edge

i can only use up to 1000p resolution..and when i try to adjust the screen using gpu scaling the options are not avalible (greyed out ) .... however when i revert back to 1920x1080 in standard resolutions scaling is avalible and thats how i originally sorted my screen out

i am right in thinking without using hd resolutions ( e.g 1000p ) i wont be able to watch HD movies or run games at hd ..

any assitance will be much appreciated

cheers guys