No Display on Mini

I am trying to use my Mini on my Sony XBR4 HDTV using DVI-HDMI. The Mini is a Power PC 1.42. When I first connected it displayed 1920X1080 but had some static and flicker issues. I tried to adjust the resolution to solve the flicker issues and my display went black. I can get a display using a DVI-VGA cable but not DVI-HDMI. I checked the cable using another computer and checked the Mini using my monitor. I have tried adjusting resolution using the monitor then connecting, that didn't work. I have tried deleting the windowserver files and safe start. Neither of those worked. Any advice would be appreciated.