I've posted this in Dell's forums as well as Hard forums and no one has an answer or knows what to do...so please help me!!!! Copied from Dell Forums: I have a Macbook Pro that I use to connect to my Dell U2410 via a Mini-Display Port-DVI cable. I've been using it flawlessly for about a month now. However today suddenly when I was using it for a split second I got that grainy "signal lost" type screen and then the screen went blank. So the first thing I tried was switching to the other DVI port, which also didn't work. However I used a friends computer and used an HDMI cable, and the monitor worked fine. So I assumed it was a problem with my Mac/and or cable. I brought my Mac and cable to another friends computer, and I attached my Mac via the same Mini-Display Port-DVI cable and it worked perfectly fine on his monitor...So what would the problem be? I'm very confused...Would it be possible that both DVI ports broke at the same time?