PC auto shut down

[SnipingBow]

So recently I had to study for an important exam and my PC would randomly boot up. So I decided to shut down the power supply mannualy (press the button to turn it off). 

Now my exam is done (so i turned the powersupply on)  and it seems that my computer goes to sleep/hibernate a soon as I leave it idle for 30 secs. I check the windows power options plan everything seems fine.

 

How can I fix this?

 

 

 

CPU: Intel Core i5-4460 3.2GHz Quad-Core Processor  ($230.01 @ Vuugo) 

Motherboard: ASRock H97 Anniversary ATX LGA1150 Motherboard  ($73.98 @ Newegg Canada) 

Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory  ($49.99 @ NCIX) 

Storage: Samsung 850 EVO-Series 250GB 2.5" Solid State Drive  ($99.99 @ Canada Computers) 

Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive  ($59.01 @ Vuugo) 

Video Card: MSI Radeon R9 390 8GB Video Card  ($424.37 @ Amazon Canada) 

Power Supply: EVGA 750W 80+ Bronze Certified Semi-Modular ATX Power Supply  ($114.75 @ Vuugo)