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Windows 7: Black screen with the letter "J" after cloning a drive

09 Apr 2018   #11

Windows 7 home premium 32bit

Quote   Quote: Originally Posted by RolandJS View Post
when a clone from source hard-drive to target hard-drive includes the Operating System, in this case, Windows, whatever the condition and configuration the OS is in on the source hard-drive, that is the condition and configuration the OS will be in on the target hard-drive. Neither cloning or full imaging will improve a "busted" or "ruined" or "somewhat non-work,ing" Operating System.
Oh ok, actually i dont have any problems with the system i just want to have it in an external drive to use it in my main PC and later put it on a new laptop once i have a new one

My System SpecsSystem Spec
09 Apr 2018   #12

Windows 7 Home Premium 64 bit sp1

Using an existing hard drive in a new laptop is very unlikely to work. When the Operating System is installed from the original DVD various drivers & other requirements are also installed that suit the new motherboard & it's hardware. So if you install an existing hard drive that has another set up for a different motherboard is will not comply with that system.

Also a lot of the new hardware technology that is currently being used in the latest computers will not run Windows 7, so this must be kept in mind.

The most important items to have backed up are your personal files, as these cannot be replaced in the event of a disaster.Operating Systems & software can be replaced & usually it will run your personal files after you install them.
My System SpecsSystem Spec
13 Apr 2018   #13

Windows 7 home premium 32bit

Sorry for the late reply but ive tried running the cloned drive on the same pc (same result) and also in my main pc wich it is windows 7 compatible and exactly the same result
My System SpecsSystem Spec

13 Apr 2018   #14

Windows 7 Ultimate x64 SP1 OEM

Hi, why not plug in a monitor to your laptop with the broken screen and extract all your data to your USB HDD.
My System SpecsSystem Spec
23 Apr 2018   #15

Windows 7 home premium 32bit

Thats what im doing but i cant take that solution on the long term i only have 1 monitor an the constant switching is very anoying
My System SpecsSystem Spec
23 Apr 2018   #16

Win 10 x64, Linux Lite, Win 7 x64, BlackArch, & Kali

Better yet, why don't you replace the display on the laptop, most are $50 US or less
Your System specs don't specify which Acer laptop you possess.

Here's Amazon page:
Acer Aspire One replacement screens
Video on replacing display/screen
Laptop screen replacement / How to replace laptop screen Acer ...

Your clone process is/was defective!

I've tried mini-tool partition wizard several times to clone a drive, all clones failed to boot.
Have you tried creating a full system image, (data only, not free space) and restoring it to your other drive?

AOMEI backupper free, or Macrium Reflect free, the former is a little more novice user friendly.
Worked every time for me!

AOMEI tutorial by Brian, Britec Computers UK:
Easy Way to Create System Image Backup - YouTube

My System SpecsSystem Spec
27 Jan 2019   #17

Solved: Black screen with the letter "J" after cloning a drive

Hello to all,

That letter "J" in the upper left corner is related to the lack of letter assigned to the new cloned partitions.

To correct that and for the new cloned drive to properly boot, you have to asign the well known letters.

To do this, you have to insert a USB instalation stick (any operating system Windows 7, 8, 8.1, 10) , or a Windows instalation DVD in order to reach a command prompt screen.

Chose repair computer, and then find the command prompt section.

In the command prompt, you have to use diskpart to asign letters:

There are few comands yo have to use:

diskpart - to see the drives
list volume - to see and chose the partitions
select volume - to make changes to that particular partition
assign letter=C - to assign the corect letter to the partition

You can find a detailed way here:

After that, your new cloned SSD or HDD will corectly boot into Windows.

Best luck to all!
My System SpecsSystem Spec
23 Dec 2019   #18

vista biz 32bit

It won't matter what type of drive it is SSD or mechanical I have tried both types when cloning and on 2 different Asus motherboards the drives boot to a J.
The only fix I found was boot to command prompt and use diskpart. The letters are usually swapped system reserve is c and main is d. You have to swap them back.
diskpart - to see the drives
list volume - to see and chose the partitions
select volume - to make changes to that particular partition
remove letter=C to remove the wrong letter C from "system reserved" partition 99-100MB
assign letter=k or whatever is available, then select volume for main partition
remove letter=d or whatever letter the main partition is (usually the largest partition)
assign letter=C
list volumes to double check that it is now correct
exit stay in command prompt and perform the following commands
enter cd C:\windows\system32 hit enter
bootrec /fixmbr hit enter
bootrec /rebuildbcd hit enter
boot to windows
Hope this works for you please let me know if you have any questions.
My System SpecsSystem Spec
09 Jan 2020   #19

Windows 7 Ultimate x64


Could you explain to me how to do this because i have the same issue ?
How to boot to command prompt and should i put the original hdd in the laptop ?
My System SpecsSystem Spec
10 Jan 2020   #20

Win 10 x64, Linux Lite, Win 7 x64, BlackArch, & Kali

My System SpecsSystem Spec

 Black screen with the letter "J" after cloning a drive

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