Hi, I'm having a really weird issue with my mid-2007 Macbook Pro. Last night, the screen randomly went black twice. I rebooted and the screen started working again, so I figured it was just a problem with the video game I was playing (Diablo 2, not a huge strain on the graphics card) and compatibility issues running Windows 7. Then, it happened again today, without the game. Normally the laptop is used with an external display, and the lid shut. I plugged in the external display and it still works when the screen is black, and I can use my computer normally. When I increase the brightness on the black display, the black gets brighter (as though the backlight works, but there's no picture...) I came across some known issues with the NVIDIA 8600M GT graphics card, but the symptoms described mention that an external monitor won't work, and that the screen is always blank. I simply restart my computer (sometimes I have to restart twice) and the laptop display will work, just randomly go black later. What could this be? I tried the hardware test using the start up CD and it seems to have detected nothing... I'm at a loss!