Mac OS X

Find what's preventing Mac from sleeping

If Mac is failing to go to sleep or is waking up unexpectedly, you can run pmset -g log | egrep '\b(Sleep|Wake|Start)\s{2,}' in terminal to inspect last sleep/wake events

$pmset -g log | egrep '\b(Sleep|Wake|Start)\s{2,}'$

Installing Mac OS - An error occurred while preparing the installation...

Issue

Installing Mac OS X on iMac's blank formatted hard drive. Installation runs for 5-10 minutes and then fails with following error:

An error occurred while preparing the installation. Try running this application again.

Tried installing OS X El Capitan (10.11) and OS X Sierra (10.12) - the same error occurs in both cases.

Mac OS L2TP/IPsec VPN connects but no access to remote network

Issue

L2TP/IPsec VPN successfully connects to a remote VPN server, but Mac OS still has no access to the remote network.

Resolution

To resolve the issue I had to select "Send all traffic over VPN connection" in VPN network Advanced settings.

Merge split iMac Fusion drive (SSD + HDD) back into one

These instructions shows how to merge an original iMac Fusion drive that for some (installing Windows, messing with Disk Utility) was split into separate SSD and HDD drives.

Warning: performing below steps will irrecoverably wipe both SSD and HDD drives. Make sure you have all your data backed up.

Find what's preventing Mac from sleeping

Installing Mac OS - An error occurred while preparing the installation...

Issue

Mac OS L2TP/IPsec VPN connects but no access to remote network

Issue

Resolution

Merge split iMac Fusion drive (SSD + HDD) back into one

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