Loud grating noise and automatic shutting down

I was writing on a blog and had created a new Wordpress page. I had not written any title nor had put any content in the body either. I chose "Pending" instead of "Draft" and went away for ten minutes.
The problem I have had with Wordpress is that it saves the draft every five minutes and with long pages or posts, the frequent automatic saving freezes the Firefox web browser I use and will cause me to Force Quit Firefox. This happens frequently - almost every time I edit a Wordpress post or page. I have to admit the post or page is usually very long and contains many images - about a hundred.
Today, I created a blank new page and went away. When I returned to the computer, I pressed a key to get going, and then a loud metallic rattling noise started plus a shadow descended over the screen.
There was a message along with this shadow that said I need to shut down the computer by pressing the Power button for several seconds, which I proceeded to do.
I then waited a minute before booting the computer.
A message came up that asked if I wanted to submit an error report to Apple as the computer had shut down in a funny way, and I submitted the report.
The only weird thing I did before the computer shut down was creating the page in Wordpress. Perhaps Wordpress.com doesn't like saving empty drafts? Maybe it created endless loops or took up all the space in the cache or something to cause my computer to act up ...
The noise was very loud. The laptop is the late 2010 model with SSD drive 250GB and 2.16 GHz.
Any opinions as to the likely the cause of this strange phenomenon?

I would boot from your USB restore drive (hold down D during boot) and run extended diagnostics to see if any hardware issues are detected. If none, watch it like a hawk and contact Apple support to follow up.

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Loud grating noise and automatic shutting down

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