Windows 10: Black screen and flashing underscore when I boot from USB

Title says it all. Using the latest ISO downloaded from the Microsoft website.

submitted by /u/theDoomguy2011
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:)

 

Blank screen with flashing underscore

Hi,



Thank you for writing to Microsoft Community Forums.



I appreciate the efforts taken by you in resolving the issue. I understand that you get a black screen with flashing underscore. I’ll certainly assist you with the issue.



However, please let us know the make and model number of the computer that you are using.



As you have already tried changing the Boot order, I would suggest you to refer the troubleshooting steps mentioned below and see if that helps.



Method 1: Rebuild BCD



You may want to try rebuilding the BCD file and see if that helps. Refer the steps mentioned below:

1. Create a bootable media and boot the PC using the
   media.
   
2. On the initial setup screen, select the language and other
   preferences and click on Next. (If you don't see the setup screen, your PC might not be set up to boot from a drive. Check your PC manufacturer's website for info on how to change your PC's boot order, and then try again.)
   
3. Now, click on Repair your computer.
   
4. On the System Recovery Options screen, select
   Troubleshoot> Advanced options > Command Prompt.
   
5. Now type in the commands and hit enter: BOOTREC /FIXMBR
   
   BOOTREC /FIXBOOT
   
   BOOTREC /scanos
   
   BOOTREC /rebuildbcd
   
6. Restart the PC.
   

Method 2: Startup Repair



If Rebuilding BCD doesn’t help, we can perform a Startup Repair on the computer and check. Refer the steps mentioned below:

1. Boot the PC using the bootable media.
   
2. On the initial setup screen, select the language and other
   preferences and click on Next. (If you don't see the setup screen, your PC might not be set up to boot from a drive. Check your PC manufacturer's website for info on how to change your PC's boot order, and then try again.)
   
3. Now, click on Repair your computer.
   
4. On the System Recovery Options screen, select
   Troubleshoot> Advanced options > Startup Repair.
   
5. Restart the PC.
   

Let us know how it goes.



Regards,

Nikhar Khare

Microsoft Community - Moderator

 

Win 10 Can't boot stuck in black screen with blinking cursor

Yesterday suddenly win 10 stop , then return blue screen with the message win need to repair and we will restarted for you , then win boot into black screen with blinking underscore .
I try to boot win from usb to use repair but it's return cant repair your pc , then through cmd in troubleshooter from usb I use list disk and its return
DISK 0 Invalid and its dynamic .
What should I do I hope the hard disk is not dead yet any suggestions please ??

 

Black screen with flashing underscore

No luck... it sounded like it tried, but still the blinking underscore.

I've messed around with the order so much, is this correct to boot from the DVD:

1) USB CDROM:

2) USB FDD:

3) ATAPI CD0: HL-DT-STDVDRAM GT30N-(S2)

4) ATA HDD0: ST9500420AS-(S1)

5) PCI LAN: Realtek Boot Agent

6) -USB HDD

Sorry for the stupid questions, but I'm digging into this way beyond my understanding!