Just returned to my perfect MBP 2012 (after 2 hours) and pressed the power button because appeared to be off (but may not have been) at this point MBP became non responsive and screen was black in colour. Then I placed a DVD in the MBP and the DVD began playback and I could hear the movie (Next Friday) but the MBP screen remained black even during DVD playback so I then hit eject and remove the DVD. Then I hold the power button for 5 seconds, the MBP shut down, now on reboot the MBP is noisy! sounds like the cooling fan is always running now now stop and the whole time I had my MBP I NEVER heard any noise from it ever, totally silent up until that moment, please help what shall I do! Please don't say the noise is normal or anything because my MBP was perfect and was totally silent up to this point..