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Black screen with a Blinking White Underscore ( _ )


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#1 Cj87

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Posted 04 December 2016 - 09:54 PM

So I haven't touched my computer in maybe almost 2months and the last time I had booted it, it was installing a very long update from windows and I let it update then I shut it down and didn't touch it till today because I've been busy and now when I turned it on it shows my motherboard loading screen then turns to a black screen with only a blinking white underscore. I've tried many solutions on other forums and none of them have worked. I can get into BIOS and it shows that my HDD is working which people have said that could be the issue, but I don't think it is.

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#2 Havachat

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Posted 05 December 2016 - 01:04 AM

Occasionally i get the same on a Desktop { if not used for some time  } with Operating System within  a Caddy { Rack } .

I remove the Rack and pull the drive and then reconnect it , and reboot , 90% of the time it then reboots fine.

 

On the odd times when it still wont boot , i have disconnected all Power Leads , and held the power button down to discharge stored  power.

Reconnect all and Boot - 2-3 times and all good again.

 

Once it didnt fix it and i had to boot to SafeMode with command prompt and then selected fixmbr or fixboot { Type Help for the exact Quotes if needed }.

Or i loaded another operating system { Rack } in the system , it booted fine , then swapped back to the other and all good . 

 

Otherwise a Installation Disc / Repair should fix any errors if found etc.

 

Dread the Cursor when it happens but its never beat me yet.

 

If you still have issues , and Data on the Drive is required then Post back.

Otherwise you may have to Reinstall Operating System.

 

If so , a good backup plan would help in the future , eg : A Boot Disk and a Saved Drive Image to get you back up and running in minutes - 

Acronis True Image / or Macrium Reflect Free will suffice to do this in the event it happens again.

I have both and have not used them when the dreaded flashing cursor appears on odd occasions of PC not being used for extended periods,



#3 Cj87

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Posted 05 December 2016 - 03:25 PM

Occasionally i get the same on a Desktop { if not used for some time  } with Operating System within  a Caddy { Rack } .
I remove the Rack and pull the drive and then reconnect it , and reboot , 90% of the time it then reboots fine.
 
On the odd times when it still wont boot , i have disconnected all Power Leads , and held the power button down to discharge stored  power.
Reconnect all and Boot - 2-3 times and all good again.
 
Once it didnt fix it and i had to boot to SafeMode with command prompt and then selected fixmbr or fixboot { Type Help for the exact Quotes if needed }.
Or i loaded another operating system { Rack } in the system , it booted fine , then swapped back to the other and all good . 
 
Otherwise a Installation Disc / Repair should fix any errors if found etc.
 
Dread the Cursor when it happens but its never beat me yet.
 
If you still have issues , and Data on the Drive is required then Post back.
Otherwise you may have to Reinstall Operating System.
 
If so , a good backup plan would help in the future , eg : A Boot Disk and a Saved Drive Image to get you back up and running in minutes - 
Acronis True Image / or Macrium Reflect Free will suffice to do this in the event it happens again.
I have both and have not used them when the dreaded flashing cursor appears on odd occasions of PC not being used for extended periods,

I have tried unplugging all power leads, with unplugging the hard drive then plugging it back in and trying to boot it but no luck. I was going to try burning windows 10 to a disc but i need to get CDs with more space. I'm not sure how to even get into safe mode because I can't do anything at all besides get into my BIOS.

#4 Havachat

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Posted 06 December 2016 - 02:45 AM

Usually tapping F8 after bios dissappears will get you into safe mode.

I dont have a lot of experience with Win 10 and UEFI settings etc , but you can load win 10 on a USB Stick and boot from that via bios / boot options.

 

Hopefully someone can assist you further with that in either repairing it or if a reinstall is needed.



#5 usasma

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Posted 06 December 2016 - 07:28 AM

First, try a clean boot to see if the problem clears up that way:  http://www.thewindowsclub.com/what-is-clean-boot-state-in-windows
If it does, then different troubleshooting steps are called for.

If that doesn't fix it, then here's some repair/recovery/restore options (try them in this order).   Be sure to backup your stuff if you don't want to take the chance of losing it.:

1 - Startup Repair.  Run it 3 times, rebooting in between tries.

2 - System Restore to a point before this started happening.

3 - DISM/SFC repair (DISM doesn't work with W7, although SFC does)  - doesn't work if you're not able to boot to Windows (let me know and I'll post a way to do it from Startup Repair)
    

Then please run the following DISM commands to see if there's any problems with the system (from an elevated (Run as administrator) Command Prompt).  Press Enter after typing it:
   
Dism /Online /Cleanup-Image /RestoreHealth

    FYI - I have repaired systems using the last command even though problems weren't found with the first 2 - so I suggest running them all.

    From this article: http://technet.microsoft.com/en-us/library/hh824869.aspx

    You can also run sfc.exe /scannow from an elevated (Run as administrator) Command Prompt to check for further corruption. Include the CBS log (located at C:\Windows\Logs\CBS\CBS.log) if you'd like to have a Windows Update expert check it (I don't check them because I can't read them)


4 - RESET using the "Keep My Files" option (W8 calls this a REFRESH; W7 and earlier doesn't have this function)

5 - Repair install of the OS (Thanks to FreeBooter!):
   

"How To Perform a Repair Installation For Windows 8, 8.1 and 10"
    https://www.winhelp.us/non-destructive-reinstall-of-windows-8-and-8-1.html

    "How to Do a Repair Install to Fix Windows 7"
    http://www.sevenforums.com/tutorials/3413-repair-install.html

    "How To Perform a Repair Installation For Vista"
    http://www.vistax64.com/tutorials/88236-repair-install-vista.html

    "Non-destructive reinstall of Windows XP"
    https://www.winhelp.us/non-destructive-reinstall-of-windows-xp.html


6 - RESET using the "Remove Everything" option (W8 calls this a RESET; W7 and earlier doesn't have this function)

If using W7 or earlier, this can be accomplished by resetting the system by use of the recovery partition/recovery disks/recovery drive.
If you don't have them, you can usually order them from the OEM manufacturer of your system ( US points of contact here:  http://www.carrona.org/recdisc.html )

7 - Wipe and reinstall from the Recovery Partition (if so equipped)

8 - Wipe and reinstall from Recovery Media - to include deleting all partitions.
If you don't have them, you can usually order them from the OEM manufacturer of your system ( US points of contact here:  http://www.carrona.org/recdisc.html )

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