The sudden shutdown thing. might be a Graphics driver Problem.
try updating it to the Newest Nvidia Driver using their handy dandy
drop down menus or the automatic driver finding tool
🙂and update Windows 8.1 to the new update 1.
use the systems own power settings. not the Samsung power profiles nor the Asus Power4gear.
I don't recommend using the Samsung RAPID Mode. since you risk loosing files if the computer instantly shuts down like that.
the drive is fast enough already
🙂and as cl-Albert said for the Keyboard
try installing the ATK package
Direct link for the ATK package for G75VX:
Herefor the sound issue also try installing a new Driver from the
support page
rig: Impact VII / 4790K / Crucial Ballistix SP 16GB 1600Mhz/ 256GB 850 Pro
Corsair AX760 / H105 AIO Watercooling / Bitfenix Prodigy
laptop: G75VW 3630QM / 670m /16GB RAM / 256GB 840 Pro + 750gb/ BD drive
Gaming OC for 670m 750/1750