Lack of Lock screen and power button not working

I'm not sure how this happened but all of a sudden 1. The lock screen has been disabled or something. e.g shutting the lid, (Windows button + L wont do anything either. 2. when pressing the power button it sleeps the laptop but now it does nothing but if i hold it it forces it to turn off.

this is really frustrating that things like this happen to it. its only 5 months old.

SPECS
Windows 8 64 bit
4gb ram
Intel Core i3-3110M CPU @ 2.40 GHz
Samsung Notebook Series 3 (350E5c-A02)