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Macbook Pro 13" mid 2012 boots only when lid is...

I shut down my MBP last night. This morning when I turned it on there was boot chime and sounds from DVD bay but no HDD sound and screen remained black. After trying a variety of things for black screen on boot up (SMS, PRAM reset etc, nothing worked), I connected it to an external monitor. Again tried to boot and found nothing on external monitor. The only way i have found that works is: Connect to external monitor, press power button and quickly close the lid. Once the login screen is seen on the monitor I can open the lid and use it with external monitor. Keybord and touch pad workbut LCD stays black (although I can see faint desktop if I shine light on it). It is not simply the question of backlight being blown as the computer simply will not boot with lid open, period.

Please help.

最后更新：2017-09-06 01:17:44

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