When I tried to boot up my MBP today, the screen remained black. The keyboard backlight comes on, I can adjust the volume, I hear the drives spinning, but the display will not show anything. I tried restarting, adjusting brightness, removing the battery, and resetting the RAM, but nothing worked. I also tried plugging in an external monitor. While it recognized an input (it moved away from the "no input" screen), it was entirely black. Is this a video card issue (I have the 2.4GHz, so it's an 8600 iirc)? What else could it be, and how can I fix it (no applecare).