Grey screen and cranking noise

My screen froze and started making cranking noises.  I turned it off.  Now, when I turn it on, it shows the grey screen and makes a ton of noise.  Help!

Is the loud noise coming from the right of the trackpad?  If so that may indicate a disk crash.  Check the following.
Boot in Recovery Mode.
http://www.apple.com/osx/recovery/
If it boots in standard recovery mode then at least part of your internal disk is working.
If it boots in network recovery mode then your internal disk may be damaged but the rest of you Mac may be healthy.
If it boots in Recovery Mode or Network Recovery Mode:
Run Disk Utility.  This will check if the disk and filesystem are healthy.
Click on the upper left disk icon.
(If there is no upper left icon then your disk has crashed.)
Does the S.M.A.R.T. status say “Verified”.
          If not the disk/SSD is unhealthy and needs to be replaced.
Click on the icon indented below, usually called “Macintosh HD”.
Verify Disk.
If it finishes with a green “OK” message then all is well with the disk.
If it shows errors in red then you may have found the problem.
If it has not crashed you may want to backup or do an emergency data copy before proceeding.
Post back with your results and for details on a possible data recovery.

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