Win7 system boot prompts An operating system wasnt found error reasons and three solutions

win 7 The computer appears black background white when prompted: An operating system wasn't found.. What should I do? The following small series brings the cause of the Win7 system boot prompt An operating system wasnt found error and three solutions, let's take a look.

Cause analysis:

The computer cannot boot to the system disk.

Solution 1:

Preparation tool: U disk boot disk

Operating steps:

1, U disk PE system will be prepared in advance Insert the USB flash drive into your computer and turn it off.

2, boot into the BIOS interface, set the U disk priority to start (or press the boot option button, select the U disk to start), enter the PE, press Enter.

3. After entering the PE system desktop, open the windows boot boot repair tool.

4, press “1” select automatic repair, wait a minute or so, it will be automatically repaired.

The method is also very simple, of course, if there is no such window repair tool in Pe, you can change a U disk boot disk, such as the mainstream computer store, the old peach is there.

Workaround 2: If not, then use Diskgenius to fix the mbr boot

Software Name:

DiskGenius(diskman) V4.7.1 Simplified Chinese Green (disk partitioning and data recovery software)

software size:

3.76MB

updated:

2015-07-01

1. After opening diskgenius, first select your [hard disk] on the left side, then click on the "hard disk"——“rebuild the master boot record mbr” on the menu bar, as shown below Shown:

4. After popping up the prompt window, click on “Yes>;

2, then the prompt “Task completion” will pop up. At this time, we have completed the operation of the master boot record mbr & rdquo; reconstruction, only need to restart the computer.

Solution 3:

1, press DEL to enter the BIOS;

2. Under the BOOT option, set the hard disk to be installed as the first boot.

It should be noted that some laptops have a combination of SSD+machines, which is set to the first boot drive depending on which hard disk the system is installed on.

Related reading:

Win10 system can not boot prompts missing operating system solution

win7 system boot black screen prompts Non-system disk or disk error failure cause and solution Method

The above is the reason why the Win7 system boot prompts An operating system wasnt found error and all the three solutions, friends with the same problem can be set up according to the above methods!