1.    21 Feb 2015 #1
    Join Date : Feb 2015
    Posts : 4
    Windows 7 Home Premium 64bit, Windows 10 Technical Preview 64bit

    Cannot boot into Windows 7 after installing Windows 10 Tech Preview


    So recently, I've installed Windows 10 on a separate partition on my 500 GB hard disk that's about 40 GB, and it works perfectly. Except that I can't boot back into Windows 7.


    All of my files are still accessible and working, I just can't actually boot into the OS. When I attempt to through the Windows 10 boot screen, first it reboots, then it goes to a black screen with 8 short lines of bright blue pixels on the top left. After a couple of moments, multi-colored pixels start appearing and changing all across the top couple of lines of pixels. This happens in the course of about a minute or so. I usually give up and turn it off cause I notice there is obviously something wrong.


    Is there anything I could do to fix this? I've looked everywhere to see if anyone had this problem, but I couldn't seem to find anything.


    Thanks in advance!


    PS: This is my first time using this forum, so excuse my nooby mistakes.
      My ComputerSystem Spec
  2.    21 Feb 2015 #2
    Join Date : Jun 2014
    Posts : 5,548
    Windows 10 Pro

    I would give it a few more minutes and see what happens.
      My ComputerSystem Spec
  3.    21 Feb 2015 #3
    Join Date : Sep 2014
    Posts : 729
    win 7 dual boot / 10

    Lots of good info in the tutorial section. Try finding what you need here https://www.tenforums.com/tutorials/2...dows-10-a.html
      My ComputerSystem Spec
  4.    21 Feb 2015 #4
    Join Date : Feb 2015
    Posts : 4
    Windows 7 Home Premium 64bit, Windows 10 Technical Preview 64bit
    Thread Starter

    Quote Originally Posted by Winuser View Post
    I would give it a few more minutes and see what happens.
    Alright, I waited a little longer and it just rebooted. Still nothing.
      My ComputerSystem Spec
  5.    21 Feb 2015 #5
    Join Date : Oct 2013
    Penns Forrest
    Posts : 3,506
    Win_8.1-Pro, Win_10.1607-Pro, Mint_17.3

    Try this: Startup Repair - Windows 7 Help Forums
    also read this one: Startup Repair - Run 3 Separate Times - Windows 7 Help Forums

    Here is a general trouble shooting guide for when Windows fails to boot.
    Troubleshooting Windows 7 Failure to Boot - Windows 7 Help Forums

    Read though all of the tutorials, ask any questions before you act (that saves time sometimes - even if you have to wait for a member to reply )

    It almost sounds as though your GPU driver is wonky.
    then it goes to a black screen with 8 short lines of bright blue pixels on the top left. After a couple of moments, multi-colored pixels start appearing and changing all across the top couple of lines of pixels

    When did you install Win10? There were some reports of a bad update last week or the week before. I didn't have any issues on my machine (HP laptop), but I don't think I fired up the Win10 machine until after the update was pulled/repaired. Sorry I don't have the KB mentioned.

    I'm not sure how to go about fixing a device driver when you cannot boot up - there's a way, I'm sure ... I just don't know it.

    I'll look around to see if I can't locate the reference to the 'bad' update. At lease then you could check to see if it's on your machine.

    There's also a good
      My ComputerSystem Spec
  6.    21 Feb 2015 #6
    Join Date : Oct 2014
    New Jersey
    Posts : 1,453
    Windows 7 Pro x64 Windows 10 Pro x64

    Someone mentioned hiding the Windows 7 letter from within 10, try that then re boot.

    There`s a thread on it.
      My ComputersSystem Spec
  7.    21 Feb 2015 #7
    Join Date : Feb 2015
    Posts : 4
    Windows 7 Home Premium 64bit, Windows 10 Technical Preview 64bit
    Thread Starter

    Quote Originally Posted by Slartybart View Post
    Try this: Startup Repair - Windows 7 Help Forums
    also read this one: Startup Repair - Run 3 Separate Times - Windows 7 Help Forums

    Here is a general trouble shooting guide for when Windows fails to boot.
    Troubleshooting Windows 7 Failure to Boot - Windows 7 Help Forums

    Read though all of the tutorials, ask any questions before you act (that saves time sometimes - even if you have to wait for a member to reply )

    It almost sounds as though your GPU driver is wonky.
    then it goes to a black screen with 8 short lines of bright blue pixels on the top left. After a couple of moments, multi-colored pixels start appearing and changing all across the top couple of lines of pixels

    When did you install Win10? There were some reports of a bad update last week or the week before. I didn't have any issues on my machine (HP laptop), but I don't think I fired up the Win10 machine until after the update was pulled/repaired. Sorry I don't have the KB mentioned.

    I'm not sure how to go about fixing a device driver when you cannot boot up - there's a way, I'm sure ... I just don't know it.

    I'll look around to see if I can't locate the reference to the 'bad' update. At lease then you could check to see if it's on your machine.
    Yeah, I just installed Windows 10 two days ago, actually, so I'm pretty sure I didn't get the bad update you're talking about. Maybe.

    I'll definitely look at the tutorials you linked and see if they help.
      My ComputerSystem Spec
  8.    21 Feb 2015 #8
    Join Date : Sep 2014
    Posts : 729
    win 7 dual boot / 10

    Did you try start up repair in the link I posted?
    Click image for larger version. 

Name:	start up repair win 10.JPG 
Views:	117 
Size:	60.7 KB 
ID:	13070
      My ComputerSystem Spec
  9.    21 Feb 2015 #9
    Join Date : Feb 2015
    Posts : 4
    Windows 7 Home Premium 64bit, Windows 10 Technical Preview 64bit
    Thread Starter

    Ok, kinda weird, but it just booted. All I did was load the boot menu, choose the HP option, and it worked. When I tried that before, It showed me the option to go into Safe Mode, and I got it to successfully boot into that, so maybe something happened in-between that made it miraculously work?

    I'm going to reboot normally, and if it doesn't work, I'll keep trying. Thanks everyone for the help. I really appreciate it.

    Quote Originally Posted by Charlie View Post
    Did you try start up repair in the link I posted?
    Click image for larger version. 

Name:	start up repair win 10.JPG 
Views:	117 
Size:	60.7 KB 
ID:	13070
    I did try that, but it asked for an administrator password for the account, and no account was listed.

    EDIT: It booted! I don't know how it's fixed, but it is. Again, thanks everyone!
      My ComputerSystem Spec

 


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