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How-To: Get Around MacBook/MacBook Pro Sleep Issues with Mac OS X 10.5.7

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Mac OS X 10.5.7 has been out less than a week and, according to MacFixIt, a number of users have reported sleep issues with MacBook and MacBook Pro notebooks upon installing the updated operating system software.
Over on the Apple Discussion Board, reader “Roger G” reported the following:

“The 10.5.7 upgrade (both with Combo and Delta from Safe mode) killed the ability of my white MacBook to sleep via clamshell closing. After a reboot, the system would sleep normally, but awakening the system and then sleeping would result in a system freeze. The monitor light on the case would not wax and wane in brightness but would stay on full. A few minutes later the fans would start spinning at full speed until the battery drained or the machine was rebooted.”

User “smitty 195” expressed a similar sentiment with the following:

“I am having the identical problem as everyone else (freezes on 2nd sleep attempt). I have a MacBook Pro, and upgraded to 10.5.7 yesterday.”

Per various reports around support forums, the issue appears to be tied into Ethernet settings on the notebooks, as described by “Andreas S.”:

“It appears that if the Ethernet is not enabled (airport only network settings) that on the MacBook Pro the sleep only works once and crashes the second time.”

The following steps are currently being offered as a fix for the issue:

1. Open System Preferences > Network
2-1. If you see your Ethernet port in your list of network ports (on the left-side of the window) and it says “Inactive,” activate the port by clicking the gear wheel icon and selecting “Make Service Active.” Click “Apply.”
2-2. If you do not see your Ethernet port in your list of network ports (on the left-side of the window), click the “+” button in the bottom-left corner.
3. In the “Interface” drop-down menu, select “Ethernet.”
4. Enter a name and select “Create.” You should see your new Ethernet connection appear.
5. Click “Apply.”
Note: If you are having this issue and your Ethernet port is already enabled, try disabling it (using the gear wheel icon menu > “Make Service Inactive”). Log out or restart your Mac, then enable it. Be sure to “Apply” your changes.

Once complete, the notebook can be testing by closing the screen and seeing if the sleep function succeeds. Be sure to try this twice, as several reports have pointed to the second attempt at sleep to be the one that causes the issue.