Symptom: I cannot toggle the sleep mode from either my keyboard shortcut or in the menu of windows 8. Both options, shutdown and restart, work perfectly fine but sleep won't work. Here is what happens when I toggle sleep: My screen shuts down but the fans still are blowing. Whenever I move my mouse or press on any peripherals the screens instantly comes back even tho I've unchecked all options allowing peripherals to wake the computer.

What I've done so far: I've tried many commands on an elevated cmd window. I've check every device in "Device manager" to see if they were allowed to wake the computer and when they were, I removed them this permission. I've updated my bios to the latest version. I've tried to check out some "s1" "s2" "s3" settings in my bios but I've found nothing that would help my case. I thought that maybe fans weren't shutting down because of heat problems. But my system is water cooled always below 40 degrees Celsius, so defenitly heat is not a problem.

System information (custom built):
i5 4670k
Corsair h75 closed loop water cooler
msi oced gtx 770, twin frozr cooler
msi h87-g43 motherboard
Samsung 840 evo 120 gbs ssd
500gh WD hdd
corsair CX750 750W
corsair vengeance 8gb dual channel memory kit
Windows 8 64bit

Mouse: logitech g600
Keyboard: A shitty hp one
Headset: logitech g430

Some more information regarding my problem.
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Yeah that's pretty much all I've got, I know lots thread have been made about this but my case is very strange and uncommon.

Thank you guys in advance for your help!
I'll be checking this thread and try what you say about 3 times a week.