Can I extract information from HD while in grey screen?

Okay, I am stuck on Grey screen with apple. Then it shuts down. No, I do not have a back up. I thought this worked like my iPhone and iPad where everything is saved. Silly me. Is there anyway that I can get the information from my laptop now?

Connect it to another Mac with a FireWire or Thunderbolt cable and start up your computer with the T key held down. You may need to use a disk repair or data recovery product to get at the files.
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