DRIVER_POWER_STATE_FAILURE after trying to go Sleep or Hibernate

The first thing I would do is disable PlexTurbo, see if that resolves the problem.

Meanwhile, I'll look at the dumps.

All the dumps are the same.

Code:

BugCheck 9F, {3, ffffe000231e9390, ffffd00074d86990, ffffe000667d5200}
Probably caused by : pci.sys

pci.sys is not the cause, it's something on the pci buss.

Looks like some problem with your NVIDIA GeForce GT 440 :

Code:

2: kd> !irp ffffe000d97f0bd0
Irp is active with 3 stacks 2 is current (= 0xffffe000d97f0ce8)
 No Mdl: No System Buffer: Thread 00000000:  Irp stack trace.  
     cmd  flg cl Device   File     Completion-Context
 [  0, 0]   0  0 00000000 00000000 00000000-00000000    

            Args: 00000000 00000000 00000000 00000000
>[ 16, 2]   0 e1 ffffe000ff501040 00000000 fffff8029138b0e8-ffffe000c25508c0 Success Error Cancel pending
          Unable to load image \SystemRoot\system32\DRIVERS\nvlddmkm.sys, Win32 error 0n2
*** WARNING: Unable to verify timestamp for nvlddmkm.sys
*** ERROR: Module load completed but symbols could not be loaded for nvlddmkm.sys
 \Driver\nvlddmkm    nt!PopRequestCompletion
            Args: 00015400 00000001 00000004 00000003
 [  0, 0]   0  0 00000000 00000000 00000000-ffffe000c25508c0    

            Args: 00000000 00000000 00000000 00000000

Code:

FAILURE_BUCKET_ID:  0x9F_3_POWER_DOWN_nvlddmkm_IMAGE_pci.sys

BUCKET_ID:  0x9F_3_POWER_DOWN_nvlddmkm_IMAGE_pci.sys

The one you have is fairly old for Nvidia: 5/11/2015 7:35:23 PM C:\Windows\system32\DRIVERS\nvlddmkm.sys

Try the 368.81 version dated 2016.7.14: http://www.nvidia.com/download/drive...x/105037/en-us