Go into Event Viewer (Windows Key + X > Event Viewer) and look for any critical errors under 'Summary of Administrative Events'.
After you are done with that, hit your Windows Key + X again, this time choose "Command Prompt (Admin)".
Highlight the command below and copy it:
powercfg /a
Now place your mouse cursor on the blinking command prompt cursor and push the rt. mouse button once (which will paste the command).
Report back your results from both.
Critical results from Event Viewer:Critical 07/09/2014 21:44:22 Kernel-Power 41 (63)
Critical 07/09/2014 09:36:33 Kernel-Power 41 (63)
Critical 07/09/2014 09:32:37 Kernel-Power 41 (63)
Critical 06/09/2014 22:44:36 Kernel-Power 41 (63)
Critical 05/09/2014 07:10:18 Kernel-Power 41 (63)
Critical 04/09/2014 07:42:42 Kernel-Power 41 (63)
Critical 03/09/2014 09:10:53 Kernel-Power 41 (63)
Critical 02/09/2014 13:50:39 Kernel-Power 41 (63)
Critical 31/08/2014 09:34:10 Kernel-Power 41 (63)
Critical 29/08/2014 08:31:48 Kernel-Power 41 (63)
Critical 28/08/2014 08:04:29 Kernel-Power 41 (63)
Critical 26/08/2014 08:52:57 Kernel-Power 41 (63)
Critical 25/08/2014 09:13:01 Kernel-Power 41 (63)
Critical 20/08/2014 21:36:57 Kernel-Power 41 (63)
Critical 20/08/2014 15:52:15 Kernel-Power 41 (63)
Critical 20/08/2014 07:12:57 Kernel-Power 41 (63)
Critical 20/08/2014 07:09:08 Kernel-Power 41 (63)
powercfg:
The following sleep states are available on this system:
Standby (S3)
Hibernate
Hybrid Sleep
Fast Startup
The following sleep states are not available on this system:
Standby (S1)
The system firmware does not support this standby state.
Standby (S2)
The system firmware does not support this standby state.
Standby (Connected)
The system firmware does not support this standby state.