Automatic Sleep no longer working on my Mac Mini :(

Question

I just noticed my Mac Mini is no more going to auto-sleep as it should.
What can I try?
Resetting both SMC and P/VRAM did not solve the issue. I've also cleaned all system and program caches, plus repaired permissions.
I've searched the forums, and found quite a lot of topics about similar issues. Most were actually about notebooks. A lot of 'go there and delete this' solutions popped out, but I feel insecure to trash entire system folders.
Anyone can provide me with a safe & complete list of what I have to delete please?

Answer 1

really? sorry about that.
I guess that forum is restricted for people with at least two stars.
Here is a repost of that link.
My Mac pro doesn't auto-sleep. I've done an extensive search for possible solutions on apple support and elsewhere but nothing seems to cure it.
I made a little sleep program of my own which I'd like to recommend to anyone with the same problem. It's a very simple shell script that checks system idle time and if it's bigger than the sleep timer you set in system preferences it puts your computer to sleep. It will work so long as you can manually put your computer to sleep from the apple menu.
You'll also need to create a launch daemon to periodically run the script.
here are the steps to do it.
1. copy and paste the following into TextEdit.
<pre style="
font-family: Monaco, 'Courier New', Courier, monospace;
font-size: 10px;
margin: 0px;
padding: 5px;
border: 1px solid #000000;
width: 720px;
color: #000000;
background-color: #ADD8E6;
overflow: auto;"
title="this text can be pasted into the Script Editor">
#!/bin/bash
idl=$"`ioreg -c IOHIDSystem | awk '/HIDIdleTime/ {print int($NF/1000000000); exit}'`"
sleeptimer=$"`defaults read /Library/Preferences/SystemConfiguration/com.apple.PowerManagement "Custom Profile" | grep "System Sleep Timer" | awk '{print $5}' | sed -e 's/;//g'`"
st=`expr $sleeptimer \* 60`
if [ $idl -gt $st ]; then
shutdown -s now
fi
</pre>
2. Format it as *plain text* (shiftcommandT in TextEdit) and save it as sleep.sh (don't use the .txt extension) at the top level of your hard drive. (You can save it elsewhere of course but make sure it's accessible to every user and change the path to the script in the commands below).
3. make it unix executable by entering the following command in terminal.
*chmod 755 /sleep.sh*
4. Download and install Lingon .
5. Open Lingon and create a new Users Daemon
Call it,say, com.sleep.launchd (the name is not important)
On line 2. enter /sleep.sh
and in section 3 set it to run every 30 seconds (that can be varied).
Click save (you'll have to enter your admin password).
6. Restart.
That's it. Once this is done you can forget about it. The sleep settings are still controlled from system preferences. The sleep agent will work with every user and even over the login window.
To uninstall it, open Lingon , select the launch daemon you made and uncheck the box "Enabled" in the upper right corner. save and restart.