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Lampras

macrumors regular
Original poster
A few hours ago, I went to go turn on my MacBook Pro (late 2013, retina, 2.4) and it immediately shows the prohibitory sign and the shuts down. I've tried to use Control-Cmd-P-R and holding shift, but none of the keys work besides the power button. I've also tried using an external keyboard and it didn't work either. If any of you know how I can resolve, it would be greatly appreciated if you responded.
 
Your symptoms may mean that your boot drive is failing, or already failed.

You can try booting to your Recovery system (Boot while holding Command-R)
If that also won't boot, then it's more evidence that your drive is failing.

Then, try booting to your Apple Diagnostics. (Boot while holding the D key)
https://support.apple.com/en-us/HT202731
 
You may have held the wrong key...
Recovery system is Command-R
Apple Diagnostics is D (only the D key)
The steps tell you to press and release the power key, then immediately begin holding the D. The test should start up.
( be sure to do this on your internal keyboard. A non-Apple keyboard, for example, might not respond properly to the boot key presses)
 
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