A few days ago, when I was working on my MacBook Pro (late 2012 model), all of the sudden Windows 7 crashed, and the display got jumbled. It appeared that something went wrong with the video adapter. So, after waiting for 4-5 minutes (and no response), I forced shutdown the machine by pressing the shutdown button for 8-10 seconds.
After few seconds, I pressed the Power button again. The usual boot gray screen appeared, with boot chime sound, and then screen turned to black. It appeared that processor was working (from the fan speed noise), but there was no display. Note that my MacBook Pro, by default boots to Windows 7. I tried this 2-3 times with same results. In panic, I finally tried to launch the OS-X, it stared the boot process, but then got stuck again near the end, and kept showing the gray screen…