Late 2012 Mac mini with OSX 10.8.2 has started shutting down instead of going into sleep mode.

Sometime in the last week or so my mac mini has started going into full shut down instead of sleep mode.
I have tried checking and unchecking energy saver boxes but haven't found anything which will get me back to where I used to be - and I haven't knowingly changed anything to make this happen.- maybe an OS update caused it?
The machine will fire up with a tablet click rather than needing the reset button to be pushed so clearly the machine is sort of halfway between sleep and full 'off'. Most frustrating as one of the key issues for me in getting this my first mac was its easy sleep and super quick fire up compared to windows.
Any help appreciated
Oh yes I just remembered that I did just install 2 8gb of crucial RAM (to replace the supplied 2 2gb but surely that can't have anything to do with it - can it)?

Adding to my first post I can now advise that when the mac goes into sleep mode the light on the front stays on (it does not pulse so clearly it is not really sleeping).
When i click the tablet / keyboard this is actually what triggers the mac to reboot
I have tried resetting the SMC as per the following link to no avail
http://macs.about.com/od/usingyourmac/qt/Resetting-The-Smc-System-Management-Con troller-On-Your-Mac.htm
Help please!

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have them perform tests to see if there is some other hardware failure involved.
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Launch the Console 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. Click Utilities, then Console in the icon grid.
Step 1
For this step, the title of the Console window should be All Messages. If it isn't, select
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from the log list on the left. If you don't see that list, select
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from the menu bar at the top of the screen.
In the top right corner of the Console window, there's a search box labeled Filter. Initially the words "String Matching" are shown in that box. Enter the name of the crashed application or process. For example, if iTunes crashed, you would enter "iTunes" (without the quotes.)
Each message in the log begins with the date and time when it was entered. Select the messages from the time of the last crash, if any. Copy them to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
☞ The log contains a vast amount of information, almost all of which is irrelevant to solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
Please don't indiscriminately dump thousands of lines from the log into this discussion.
Please don't post screenshots of log messages—post the text.
☞ Some private information, such as your name, may appear in the log. Anonymize before posting.
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I know the report is long, maybe several hundred lines. Please post all of it anyway.
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Late 2012 Mac mini upgrade ssd - also install parallels 8 and windows 7

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http://eshop.macsales.com/item/OWC/DIYIMM11D2/
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https://discussions.apple.com/message/23819753#23819753
http://www.mactrast.com/2013/11/enable-trim-ssds-os-x-mavericks/

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Welcome to the family. Search this forum for the main thread for this problem titled: "mac mini 2012 video blinking out".

Late 2012 mac mini display signal drops while booting and monitor goes to sleep

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Welcome to the family. Search this forum for the main thread for this problem titled: "mac mini 2012 video blinking out".

I have a mid 2011 27 inch iMac and a late 2012 mac mini. I am using the 27 inch iMac as the display for the mac mini. I was trying to use bootcamp on the mini but after I started downloading windows I can't get it to display on the iMac.

I have a mid 2011 27 inch iMac and a late 2012 mac mini. I am using the 27 inch iMac as the display for the mac mini with a thunderbolt cable. I was trying to use bootcamp on the mini but after I started downloading windows I can't get it to display on the iMac.

Hi there,
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AJ

Late 2012 Mac mini with OSX 10.8.2 has started shutting down instead of going into sleep mode.

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