I have a first gen 1.25 GHz G4 Mac Mini that I have hooked up with a DVI-HDMI cable to my 42 inch Vizio. Everything runs great when I turn on the computer, and the signal is registering on my TV as 1080P. However, after about 10 minutes of being turned on, the picture starts getting a static like look. It gets worse and worse until the TV just says not supported, and finally no signal. Even after connecting through my VNC client and shutting down then restarting the Mini, I get no signal. I've hooked up the Mini to a 17 inch Dell LCD monitor and have had no problems with a simple DVI-DVI cable, and I've hooked up my cable box to the same HDMI port to rule out that as the source. What I'm trying to figure out is if it's the DVI-HDMI cable at fault, or the Mini's graphics card. Like I said before, restarting the Mini doesn't fix the problem. The only way I can get a signal on my TV again is to wait 30 minutes or so. This is making me think maybe the GPU is getting too hot and needs to cool down. I've also tried running 720P and a simple 1024x768 like I run on the Dell LCD, but unless I wait 30+ minutes I get nothing on the TV. If it's just the cable I'll return it and buy another one, but if it's the Mini I'm going to just ebay it. Thanks in advance.