HELP....Black screen??

[dvboy]

For the last week or so my screen out of nowhere just turns black with the backlight on slightly.I tried a soft reset and a hard reset and the screen just stays black?The strange thing is that it can receive phone calls and messages and can sync with activesync?If I attempt to hard reset it for a couple hours fiddling around with it I can actually get it to hard reset and back to normal,but then the next morning back to the black screen to do this fun all over again.I am using the stock bell rom,and because I can use activesync,I re flashed it only to come back to this black screen.Any ideas,really getting frustrating for me!!