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when I press Shift + Control + Eject the displays go blank for a second, then they turn on again.
There's no way I can get them off permanently.
I also don't want the computer to sleep as I leave it downloading over night.
I have a MacBook with an external monitor attached.

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As I understand you ask 2 different question, you can't permanently turn off your screen and let your macbook download your file during night? – Am1rr3zA Feb 3 '11 at 20:34
May be I wasn't clear enough. What I want is to put the displays to sleep and that they stay off, which doesn't happen. – Petruza Feb 4 '11 at 2:42
Newer Macbook Pros use Ctrl+Shift + Power, because they lack an Eject button. There is also the option of using a "Hot Corner" for the same effect. This problem still exists. Haven't tried power cycling to reset to SMC yet... I wonder if that really would solve it. – starlocke Jan 2 '14 at 14:53
up vote 1 down vote accepted

Sometimes this can be due to the System Management Controller. Try resetting the SMC and see if that helps

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Thanks, gonna test – Petruza Feb 4 '11 at 2:40
Great, tried it and worked. I hope it keeps working. Thanks! – Petruza Feb 4 '11 at 2:49

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