Computer hard freezing constantly, req. restart

Hello,
I have had this problem for about 2 years now so the idea of it possibly being hardware failure is confusing to me. I have also done various steps to try and eliminate certain things.

SYMPTOMS
When I am working on photoshop and watching a film/youtube the computer can sometimes at random freeze and not unfreeze. The only way to unfreeze is to hold in the power button for 10 seconds. This can also happen while playing video games and even when just using photoshop and listening to spotify.

These symptoms have become worse where it is happening about twice a day, rather than just a few days a week. Another thing that has started happening is the fans and LED's will not start-up except for the CPU fan and 'noises' happening to show its starting up. But nothing comes on screen. The fix for this was to reseat all the hardware connectors. Another time it was to unplug everything and hold down the power button for 30 seconds.

Things I have tried to fix it:
Changed from Windows 7 to a clean install of windows 10 (no fix)
Changed graphics card (no fix)
Changed Power supply (no fix)
Changed themal paste on CPU (no fix)
Added a bigger fan on cpu (no fix)
Updated all drivers except for bios (no fix)
Installed all windows updates and chip-sets.
Ran memory diagnostics and come back with no errors

The PC runs fine and can play all the latest games at best settings. But whatever is happening just happens randomly and with no prior symptoms. It's as if something just chokes and then freezes everything in place to avoid damage.

No idea where to post this so added it to Components section.

Here is the first part to my DXDIAG:

------------------
System Information
------------------
Time of this report: 6/14/2017, 10:41:04
Machine name: ANDREW-PC
Machine Id: {46954806-50F5-4129-BFDB-C35A4B18FB04}
Operating System: Windows 10 Pro 64-bit (10.0, Build 15063) (15063.rs2_release.170317-1834)
Language: English (Regional Setting: English)
System Manufacturer: To Be Filled By O.E.M.
System Model: To Be Filled By O.E.M.
BIOS: BIOS Date: 07/11/11 15:46:09 Ver: 04.06.04
Processor: n/a
Memory: 8192MB RAM
Available OS Memory: 8174MB RAM
Page File: 2128MB used, 8990MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 12
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
Miracast: Available, with HDCP
Microsoft Graphics Hybrid: Not Supported
DxDiag Version: 10.00.15063.0000 64bit Unicode

---------------
Display Devices
---------------
Card name: NVIDIA GeForce GTX 950
Manufacturer: NVIDIA
Chip type: GeForce GTX 950
DAC type: Integrated RAMDAC
Device Type: Full Device
Device Key: Enum\PCI\VEN_10DE&DEV_1402&SUBSYS_29513842&REV_A1
Device Status: 0180200A [DN_DRIVER_LOADED|DN_STARTED|DN_DISABLEABLE|DN_NT_ENUMERATOR|DN_NT_DRIVER]
Device Problem Code: No Problem
Driver Problem Code: Unknown
Display Memory: 6105 MB
Dedicated Memory: 2017 MB
Shared Memory: 4087 MB
Current Mode: 1920 x 1200 (32 bit) (59Hz)
Monitor Name: SyncMaster 245B/245BW/245BPlus(Digital)
Monitor Model: SyncMaster
Monitor Id: SAM02B6
Native Mode: 1920 x 1200(p) (59.950Hz)
Output Type: DVI
Driver Name: C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_a2b0acab06663645\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_a2b0acab06663645\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_a2b0acab06663645\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_a2b0acab06663645\nvldumdx.dll
Driver File Version: 22.21.0013.8205 (English)
Driver Version: 22.21.13.8205
DDI Version: 12
Feature Levels: 12_1,12_0,11_1,11_0,10_1,10_0,9_3,9_2,9_1
Driver Model: WDDM 2.2
Graphics Preemption: DMA
Compute Preemption: DMA
Miracast: Not Supported by Graphics driver
Hybrid Graphics GPU: Not Supported
Power P-states: Not Supported
Driver Attributes: Final Retail
Driver Date/Size: 01/05/2017 01:00:00, 885032 bytes
WHQL Logo'd: Yes
WHQL Date Stamp: Unknown
Device Identifier: {D7B71E3E-5742-11CF-FF7B-5C091BC2DB35}
Vendor ID: 0x10DE
Device ID: 0x1402
SubSys ID: 0x29513842
Revision ID: 0x00A1
Driver Strong Name: oem10.inf:0f066de3d2378488:Section088:22.21.13.8205ci\ven_10de&dev_1402
Rank Of Driver: 00D12001
Video Accel:


----


D3D9 Overlay: Supported
DXVA-HD: Supported
DDraw Status: Enabled
D3D Status: Enabled
AGP Status: Enabled
MPO Caps: Not Supported
MPO Stretch: Not Supported
MPO Media Hints: Not Supported
MPO Formats: Not Supported

-------------
Sound Devices
-------------
Description: Speakers (Realtek High Definition Audio)
Default Sound Playback: Yes
Default Voice Playback: Yes
Hardware ID: HDAUDIO\FUNC_01&VEN_10EC&DEV_0892&SUBSYS_18498892&REV_1003
Manufacturer ID: 1
Product ID: 100
Type: WDM
Driver Name: RTKVHD64.sys
Driver Version: 6.00.0001.7535 (English)
Driver Attributes: Final Retail
WHQL Logo'd: Yes
Date and Size: 16/06/2015 00:00:00, 4504320 bytes
Other Files:
Driver Provider: Realtek Semiconductor Corp.
HW Accel Level: Basic
Cap Flags: 0xF1F
Min/Max Sample Rate: 100, 200000
Static/Strm HW Mix Bufs: 1, 0
Static/Strm HW 3D Bufs: 0, 0
HW Memory: 0
Voice Management: No
EAX(tm) 2.0 Listen/Src: No, No
I3DL2(tm) Listen/Src: No, No
Sensaura(tm) ZoomFX(tm): No

Description: Realtek Digital Output (Realtek High Definition Audio)
Default Sound Playback: No
Default Voice Playback: No
Hardware ID: HDAUDIO\FUNC_01&VEN_10EC&DEV_0892&SUBSYS_18498892&REV_1003
Manufacturer ID: 1
Product ID: 100
Type: WDM
Driver Name: RTKVHD64.sys
Driver Version: 6.00.0001.7535 (English)
Driver Attributes: Final Retail
WHQL Logo'd: Yes
Date and Size: 16/06/2015 00:00:00, 4504320 bytes
Other Files:
Driver Provider: Realtek Semiconductor Corp.
HW Accel Level: Basic
Cap Flags: 0xF1F
Min/Max Sample Rate: 100, 200000
Static/Strm HW Mix Bufs: 1, 0
Static/Strm HW 3D Bufs: 0, 0
HW Memory: 0
Voice Management: No
EAX(tm) 2.0 Listen/Src: No, No
I3DL2(tm) Listen/Src: No, No