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I get a flashing question mark in a folder icon...

When I power up my MacBook Pro, I get a bluish screen, a flashing folder icon with a question mark on it, which sometimes turns into the universal no symbol, and then I get no further. 

This first happened after my mac suddenly turned itself off while I was using it. After some unsuccessful attempts at starting it, I waited til the next day, and all of a sudden it did start. When I logged in, everything I had open when it shut down reopened, and I see that I've suddenly got a tab open that says something along the lines of "congratulations on downloading safari recovery", which, I didn't download, so I'm guessing maybe a virus? 

Half an hour later, my mac shut down again, and that's where I am now. I googled some on my phone, and found a couple of possible solutions, but none of them have helped so far:

I've tried powering up, then holding down Command + R. 

I've tried powering up and holding down the shift key.

I've tried pressing the power button while holding down Option + Command + P + R.

I don't have a disc to reinstall Mac OS X, I never had one, I got my mac via school, so now I don't really know what to do any more.

Please help me!

The flashing question mark (possibly with folder or Prohibitory sign) means that some essential components needed for starting up MacOS are missing or damaged.

First, make sure the Drive Directory is OK:

The usual first line of defense is to Boot into Safe Mode, but if you cannot boot up normally, Safe Mode is unlikely to work.

--OR-- boot into Recovery mode ... AND use Disk Utility to Repair the disk. Simply entering Recovery Mode does nothing for you.

Once the drive directory has been repaired, if the problem persists, an essential file is missing or damaged:

You will need to re-Install MacOS. This cannot be done on a still-damaged damaged disk.

Installing Mac OS, right on top of an existing copy of MacOS, is not intended to delete ANYTHING outside of MacOS. Nothing is bulk erased, but over 350,000 files are re-written. But if something were to go wrong, you could lose some of your files.

Do not be in a Big hurry to ERASE the internal drive, because that deletes ALL your files.

If you have access to an Apple-owned store, you can make a genius bar appointment for an evaluation. They MAY (or may not) be able to help you salvage some files.

What model Mac (including screen size and year), and what version of MacOS are you running?

最後更新：2017-09-18 01:20:57

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