I have a MacBook Pro and it starts up but the screen will not come on - any suggestions?

I have a MacBook Pro and it starts up but the screen will not come on - any suggestions?

The simplest operation your Mac can do is start up with the Option key held down. The code is all in ROM. It uses a One size fits all resolution to light up the display and draw an icon for each potentially bootable Volume.
The most effective thing your Mac can do when confused is to start up using the Shift key. It does one pass of Disk Utility "Repair Disk" then boots up with minimal extensions loaded and ask you to login. But if your Mac is really sick, it may never get there.

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