I am having a problem when connecting my Macbook to my Toshiba HDTV. I am using a mini-dvi to dvi converter and attaching it to a six foot dvi to hdmi cable. The problems is that at random times the TV screen will go black and stay black for about two seconds. It then comes back on and all is fine. I can be watching movies or just leaving it on the desktop it does not seem to matter. Any help would be greatly appreciated, I am not sure if it is computer, TV, or cables causing this. Thanks.