After update Windows 10 will not boot up

Hello every one, il be glad if someone can help me here
I had the latest build of windows 10 downloaded and the PC restarted to install it, i left it at that, when i got back i had a black screen with nothing on it, for a few hours so i restarted the PC, when it come back up the BIOS pop out, there is only a
boot sitting for "Windows Boot Manager (PO: ST9750422AS)" and "Disabled", i tryed to restart the system a few times but it dose not seem to help
Any one have any idea? if nothing come up i guess il try to format if possible and reinstall windows, but if i can avoid that and get also the few files that are not backed up yet back il be glad to cut off that hassle
Thanks guys waiting for your response

Hello every one, il be glad if someone can help me here
I had the latest build of windows 10 downloaded and the PC restarted to install it, i left it at that, when i got back i had a black screen with nothing on it, for a few hours so i restarted the PC, when it come back up the BIOS pop out, there is only a
boot sitting for "Windows Boot Manager (PO: ST9750422AS)" and "Disabled", i tryed to restart the system a few times but it dose not seem to help
Any one have any idea? if nothing come up i guess il try to format if possible and reinstall windows, but if i can avoid that and get also the few files that are not backed up yet back il be glad to cut off that hassle
Thanks guys waiting for your response
Since you have the media to reinstall Windows, that will be your best bet.
Win 10 TP is still a beta. There can be numerous possibilities that resulted in the "black screen" situation. You could be running around like the proverbial " chicken without a head " trying to solve the problem.
Save the headache, reinstall and start from scratch. Unfortunately you will be losing the files you have not backed up.
Another suggestion :
If you can wait and if you have  computer #2......
It is quite possible that a new build is forthcoming soon.
Use your computer #2 to download the new build ISO file, burn it to a bootable DVD or USB > use it to install the new build into computer #1.

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       8:                 Apple_Boot Mountain Lion Recove... 650.0 MB   disk3s8
    diskutil cs list
    CoreStorage logical volume groups (1 found)
    |
    +-- Logical Volume Group A8C00490-0E14-401F-AB69-59F37724E8C4
        =========================================================
        Name:         Fusion
        Size:         1190201270272 B (1.2 TB)
        Free Space:   0 B (0 B)
        |
        +-< Physical Volume 4772013B-5520-4801-9BE5-BCAEF4AEDAB3
        |   ----------------------------------------------------
        |   Index:    0
        |   Disk:     disk0s2
        |   Status:   Online
        |   Size:     255716540416 B (255.7 GB)
        |
        +-< Physical Volume A679A101-3C78-4A59-B5EE-A4339210CFAD
        |   ----------------------------------------------------
        |   Index:    1
        |   Disk:     disk1s2
        |   Status:   Online
        |   Size:     934484729856 B (934.5 GB)
        |
        +-> Logical Volume Family 5EF5C7CA-0B9C-4169-82A1-41C84F206672
            Encryption Status:       Unlocked
            Encryption Type:         None
            Conversion Status:       NoConversion
            Conversion Direction:    -none-
            Has Encrypted Extents:   No
            Fully Secure:            No
            Passphrase Required:     No
            |
            +-> Logical Volume 1512657C-ED13-4B31-82C6-7AECBBCA7F98
                Disk:               disk2
                Status:             Online
                Size (Total):       1185508581376 B (1.2 TB)
                Size (Converted):   -none-
                Revertible:         No
                LV Name:            Fusion HD
                Volume Name:        Fusion HD
                Content Hint:       Apple_HFS
    sudo gpt -r -vv show disk1
    gpt show: disk1: mediasize=1000204886016; sectorsize=512; blocks=1953525168
    gpt show: disk1: Suspicious MBR at sector 0
    gpt show: disk1: Pri GPT at sector 1
    gpt show: disk1: Sec GPT at sector 1953525167
           start        size  index  contents
               0           1         MBR
               1           1         Pri GPT header
               2          32         Pri GPT table
              34           6        
              40      409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
          409640  1825165488      2  GPT part - 53746F72-6167-11AA-AA11-00306543ECAC
      1825575128     1269544      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
      1826844672   126679040      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
      1953523712        1423        
      1953525135          32         Sec GPT table
      1953525167           1         Sec GPT header

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