I have a 2.4GHz Intel Core Duo Macbook Pro with 4GB RAM and a NVIDIA GeForce 8600M GT Graphics card, and up until a few days ago I have been able to hook up a 23" Samsung HDTV monitor through the DVI output to use as a monitor when I am editing larger timelines and animating in After Effects. Now my laptop isn't detecting the monitor, although when I insert the DVI cable into the laptop the Samsung monitor flashes, and the laptop screen goes blue for a few seconds. I have checked the DVI input into the monitor and it works fine, and I have also changed DVI cables, so I can only assume that there is something wrong with either my DVI port or my graphics card. Any suggestions?