This worked for me on a Lenovo Thinkpad SL 500.
Open Configuration Editor in terminal (mateconf-editor)
Goto: apps/mate-power-manager/buttons
Change lid-ac from "blank" to "nothing"
Open Preferences/Screensaver/Power Management in the menu.
Make sure "When laptop lid is closed" is set to "Do nothing". Click "Make Default" button.
(Based on http://superuser.com/questions/466899/mint-13-does-nothing-when-laptop-lid-is-closed)
Run Linux Mint 14 Mate 32 on a laptop with the lid closed
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Don't add support questions to tutorials; start your own topic in the appropriate sub-forum instead. Before you post read forum rules
Run Linux Mint 14 Mate 32 on a laptop with the lid closed
Linux Mint Mate 21.2 64, fanless box with passive cooling