Windows 7 64 bit will not boot in any mode.

Disconnect all peripherals and unnecessary hardware and go to BIOS and reset to default. Have you tried to boot with driver signature and Boot logging?? If you are able to go to safe mode, disable automatic restart in advance recovery options. If nothing works, stay in BIOS and see if it hangs there. Minimal hardware will ensure least interference and it will be easy to detect the failure point. Its quite possible the HDD itself may be the issue. Once you disable automatic restart, you will be able to stay in BSOD and see the error code.

Run the Disk manufacturer's diagnostic utility on the HD (long test). If it shows errors, replace the disk. Also test the RAM with memtest86+. Both of those tools are included on the UBCD:

http://mirror.sysadminguide.net/ubcd/ubcd536.iso

I disconnected all peripherals, reset the BIOS to default but with the same result.
I cannot boot in to safe mode

UBCD536 doesn't offer a test for Samsung EVO 850 SSD

For SSD's you will have to remove the SSD from the PC and attach it as a 2nd disk to another PC running Windows. then download and run the SSD Manufacturer's utility (from Samsung in your case). You can then run that diagnostic. Also check for ritmware updates for the SSD (the diag utility usually has that as an option).

Yup,you'll need to run Samsung Magician from another system.
http://www.samsung.com/semiconductor/minisite/ssd/download/tools.html

Have you tried resetting the SATA interface to ahci or something else in the bios?

I have seen this twice before.  Never resolved without clean OS install.  Atleast the last time I saw this, a clean OS install worked and the PC has been rock solid for over a year.  It's still in service with no hardware changes.

if you use the F8 key during boot, can you enter the screen and select not to restart automatic ?
you can also hook the drive to a working PC and copy the dmp file
find it in windows\minidumps

(you can also copy the dmp when booted from a live cd - or USB)

I've to go and find a desktop to allow me to connect this suspect SSD to.
Samsung magician only found my system disk.
Windows explorer 'saw' the suspect drive.
I'll go and find the dmp file but I suspect it isn't there because of the speed of the blue screen there was no time to create a dmp file.
I may try running chkdsk on the suspect SSD when connected to my working computer.

>Samsung magician only found my system disk.
Sounds like you may have a bad SSD.
You didn't have any disk encryption on the SSD ,right?

I ran chkdsk /f /r /x and there were no problems.
I uninstalled magician and then reinstalled it with the suspect SSD connected and it found it this time.
I ran a benchmark and it ran ok.
Unfortunately Magician causes my windows 10 machine to freeze when I reboot so I'm going to have to try something else.

Have checked the SSD's Firmware, and upgraded it if it isn't already the current version?

>causes my windows 10 machine to freeze

 Are you using a usb to sata adapter or just another port off the mobo?

Samsung Magician 497 freezes my computer. I'll try again with this but it is extremely frustrating.
I'm connected to a SATA port on the Motherboard.

>>   I suspect it isn't there because of the speed of the blue screen there was no time to create a dmp file.  <<  sure there iscreating a 256 kb file does not take time

but your system must have been set to make minidumps of course

I'll get back to this later this week. I am trying to get access to another computer which will run Samsung Magician. It certainly looks like this is going to be a complete wipe.
I searched the suspect SSD for any dump files but couldn't find any relating to microsoft.
I don't know anything about system set to make minidumps. Everything is as default.

i f you happen to boot it up - here's how it should be set :
http://blog.nirsoft.net/2010/07/27/how-to-configure-windows-to-create-minidump-files-on-bsod/

when you looked for the dmp file -did you enable "show hidden files"?

if no more help is needed- don't forget to close this Q

This was the solution
Wipe the Drive