Mac Book Pro will not sleep with lid closed

Launch the built-in Activity Monitor application and select the Energy tab. Select

View ▹ All Processes

from the menu bar, if it's not already selected. Also select

View ▹ Columns ▹ Power Assertion

Click the heading of the Preventing Sleep column to sort the process table. Which processes, if any, show Yes in that column?

This procedure is a diagnostic test. It makes no changes to your data.

Please triple-click anywhere in the line below on this page to select it:

pmset -g assertions | pbcopy

Copy the selected text to the Clipboard by pressing the key combination command-C.

Launch the built-in Terminal application in any of the following ways:

☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)

☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.

☞ Open LaunchPad and start typing the name.

Paste into the Terminal window by pressing the key combination command-V. I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting.

Wait for a new line ending in a dollar sign ($) to appear below what you entered.

The output of the command will be automatically copied to the Clipboard. If the command produced no output, the Clipboard will be empty. Paste into a reply to this message.

The Terminal window doesn't show the output. Please don't copy anything from there.

 ▹ System Preferences... ▹ Bluetooth ▹ Advanced... ▹ Allow Bluetooth devices to wake this computer: uncheck.

Test after each of the following steps that you haven’t already tried:

Step 1

Take all the steps suggested in this support article. That's the starting point for any further effort to solve the problem. Skipping any of those steps may mean that the problem won't be solved. Note that, as stated in the article, the computer will not sleep if some sharing services are enabled.

Step 2

From the menu bar, select

 ▹ System Preferences ▹ Accessibility ▹ Speakable Items: Off

Step 3

Select

 ▹ System Preferences ▹ Bluetooth ▹ Advanced...

and uncheck both boxes marked

Open Bluetooth Setup Assistant at startup if...

Step 4

Disconnect all wired peripherals and test. If you use a wired keyboard and/or mouse, use different ones. You must rule out the wired keyboard and mouse as possible causes of the problem.

Step 5

Reset the SMC.

Step 6

Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.

Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.

The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.

Safe mode is much slower to start and run than normal. Don’t launch any applications at first. If sleep still doesn’t work properly, back up all data and reinstall the OS. After that, if you still have the issue, make a “Genius” appointment at an Apple Store to have the machine tested.

If sleep now works as expected, go on to the next step.

Step 7

Still in safe mode, launch the usual set of applications that are running when you have the problem, including your login items, one at a time, testing after each one. Some applications may not work; skip them. You might be able to identify the cause of the problem this way.

Step 8

If sleep is still working after you’ve launched all the usual applications, restart as usual (not in safe mode) and test again. If sleep still works, you’re done, at least for the moment.

If you still have the sleep issue after restarting out of safe mode, post again.

For anyone who still has this problem, there is one other thing to make sure of. I had this issue and it was from internet sharing being enabled by someone else. When internet sharing is enabled a MacBook running Yosemite will not sleep when plugged into AC even if you close the lid. To check if this was enabled by you or someone else: go to System Preferences -> Sharing and make sure Internet Sharing is unchecked. This solved my problem.

This totally solved my problem. I had almost given up and decided to just live with it, but apparently this is what was hanging it up. Now my computer sleeps with AC connected or not! Great find!

a process named 'hidd' says YES.

what should i do?

It was network sharing for me. Thank you rs3859!