Operating system not found windows 7 acer laptop

When I shut down my laptop and turn it back on, I get the error message in the top-left corner that says “Operating System Not Found”.  I then hit the power button to turn off and then hit it again to turn on, and the laptop boots up just fine. Whats going on here?  Even if I select “restart” … the error messge comes up when it tries to restart after shutting down.  

 

It works when I just turn it off after the message and turn it back on – but I am concerned.  The PC is only a month old and this just started happening a few days ago and seems to happen every time.

 

Thanks!!!

 

–Ryan

So I think this is a corrupt BIOS. You mentioned in the comments that it lost power during a factory reset… while I don’t know that this would need to interact with BIOS at all I wonder if it might have done that. As far as I’m aware there’s only two ways to fix this issue.

The first would require you to hookup a BIOS programmer card to the BIOS chip on the motherboard.

The second option is to buy a new BIOS chip. eBay usually has tons of these. Just make sure they match your needs. If you are comfortable with soldering and using a heat gun you can remove the old BIOS chip from the board and replace it with the new one.

Of course there are some motherboards with dual BIOS and a toggle switch but this isn’t common on laptops. Since this is a budget laptop I would be pretty surprised to see it there.

Can’t boot Acer: Operating system not found

“I can’t access Windows 10 operating system normally and get the error message “Operating System not found” when I turn my Acer laptop on. I have no idea what happens and what should I do? I really need your help. Thanks!”

The analysis and fixes for operating system not found on Acer

The issue operating system not found or missing operating system in Acer can come up mainly out of the following reasons:

▪ There is something wrong with BIOS Settings.
▪ The MBR of the system hard drive is damaged
▪ The system hard drive is corrupted.
▪ Windows system partition is not marked as active.

Based on the events that can account for the warning, you can try one or more of the methods presented in the next context.

✔ Fix 1. Check BIOS Settings

If the issue appears after you adjust the BIOS Settings, the most possible issue can be improper BIOS Settings. Follow the steps below to check BIOS Settings:

1. Restart the Acer computer and press a certain key to enter BIOS.

2. In the BIOS Main Tab, check whether your system disk is detected. If not, change the connection cable to see if it works. If you still get the same error, you can reset the BIOS to default settings.

✔ Fix 2. Repair corrupted MBR

If the issue occurs due to corrupted MBR, you can do as follows to repair damaged MBR via Command Prompt.

1. Boot from Windows installation/repair disk.

2. Choose Langue, Time, and Keyboard input. Then, click Next.

3. In the Install now screen, click Repair your computer.

4. Go to Troubleshoot >Advanced>Command Prompt.

5. Type “bootrec /fixmbr” and press Enter.

If you have no way to access Command Prompt, you can turn to AOMEI Partition Assistant Standard to rebuild MBR. Free download it on a working Windows-based computer, install and run it to create a bootable USB drive or CD , and boot your Acer laptop or desktop from the bootable media. After booting successfully, you will access the main interface of AOMEI Partition Assistant automatically.

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Then, refer to the steps below:

1. Right-click the disk holding damaged MBR and choose “Rebuild MBR”.

2. Choose a proper MBR type according to your current operating system (Here is Windows 10).

3. Confirm your operation and click “Apply”>“Proceed” to perform it.

After rebuilding MBR, unplug the bootable device, reboot computer, and enter BIOS to boot from the repaired hard drive to see whether the issue still exists.

✔ Fix 3. Set Windows system partition active

If the system partition is no longer active, you can also get a message saying cannot find the operating system on Startup. At this time, you can set the system active to solve it. Here are the detailed steps:

1. Boot your Acer computer from the bootable media made by AOMEI Partition Assistant Standard.

2. In the main console, right-click the boot partition and go to “Advanced”>“Set Active Partition”.

Then, follow the prompts given by AOMEI Partition Assistant to complete the operation. 

After setting partition active, remove the bootable device, reboot the computer from system hard drive.

★Tips:AOMEI Partition Assistant Standard is suitable for Windows 10/8.1/8/7, XP, and Vista, if you are a Windows Server user, employ AOMEI Partition Assistant Server.This software is featured with many other functions like extending partition without data loss, copying partition, and so on

Wrap things up

When you encounter Operating System not found error for Acer laptop or desktop on Startup, there is no need to try every method listed above; you can speculate the most possible cause and take corresponding solutions then. If all measures aforementioned are invalid, it is time to turn a certain tool to diagnose the system hard drive.

When trying to boot Windows, you receive the error: An operating system wasn’t found. Try disconnecting any drives that don’t contain an operating system. Press Ctrl+Alt+Del to restart

Resolution

A bootable USB or DVD with Windows 7 or higher is needed to bring up the Command Prompt. If you don’t have a bootable media available, you can obtain one by following the create installation media steps found here.

Bring up the command prompt:

  1. Boot from any DVD or USB Windows 7, 8, or 10 media.

  2. Once you have reached the Windows Setup screen (where you select the Language, Time and Keyboard settings), press the SHIFT + F10 keys to bring up the Command Prompt.

Find out whether your disk is set to GUID Partition Table (GPT) or Master Boot Record (MBR):

  1. In the Command Prompt, type diskpartand press Enter.

  2. Type list disk and press Enter.

  3. Look for your disk and see if the GPT column has an asterisk (*) – this will indicate the disk is GPT. If no asterisk is found, then the disk is set as MBR.

  4. Type exit and press Enter.

If the type is MBR:

  1. From the Command Prompt, type dir a: and press Enter.

    1. If drive A: is found and a directory is displayed, check for the Windows folder in the directory. If it is there, that is the System Drive. Skip to step 2.

    2. If the drive is not found or it doesn’t contain the Windows folder, type dir b: and press Enter. Continue through the alphabet until the drive with the Windows folder is found, but skip the X: drive. That will be the install files from the USB or DVD you are using. The most common location is the C: drive, so that example will be used in the rest of the article.

  2. Once it is found, type:bcdboot C:Windows /S C:

    1. In this case, C is the drive where Windows folder was found. If the Windows folder is on a different drive, use that drive letter instead of “C” in the bcdboot command above.

  3. The message Boot files successfully created must be shown before you can continue.

  4. Type: diskpart and press Enter.

  5. Type: list disk and press Enter.

  6. Type: sel disk C and press Enter.

    1. In this case, C is the drive where Windows folder was found. If the Windows folder is on a different drive, use that drive letter instead of “C” in the sel disk command above.

  7. Type: list vol and press Enter.

  8. Type: sel vol C and press Enter.

    1. In this case, C is the drive where Windows folder was found. If the Windows folder is on a different drive, use that drive letter instead of “C” in the sel disk command above.

  9. Type: active and press Enter.

    1. You should get a confirmation that the volume has been successfully set as active. If you don’t get the confirmation, it means that either the disk is set to GPT (not MBR), or there is a problem with the disk. Make sure you are working with the right disk.

  10. Type: exit and press Enter.

  11. Reboot the device – you can do this quickly from the command prompt by typing: shutdown -f -r -t 00 and press Enter.

If the type is GPT:

  1. From the Command Prompt, type dir a: and press Enter.

    1. If drive A: is found and a directory is displayed, check for the Windows folder in the directory. If it is there, that is the System Drive. Skip to step 2.

    2. If the drive is not found or it doesn’t contain the Windows folder, type dir b: and press Enter. Continue through the alphabet until the drive with the Windows folder is found, but skip the X: drive. That will be the install files from the USB or DVD you are using. The most common location is the C: drive, so that example will be used in the rest of the article.

  2. Type: diskpart and press Enter.

  3. Type: list disk and press Enter

  4. Type: sel disk C and press Enter.

    1. In this case, C is the drive where Windows folder was found. If the Windows folder is on a different drive, use that drive letter instead of “C” in the sel disk command above.

  5. Type: list part and press Enter.

  6. Look for the partition labeled as System.

  7. Once it is found, assign the letter R to the partition. If the letter R is already taken, you can choose any unassigned letter. To assign the letter type: assign letter=r: and press Enter.

  8. Type: exit and press Enter.

  9. Return to the command prompt, type the following one line at a time, pressing Enter after each line:

    1. cd /d r:EFIMicrosoftBoot

    2. ren BCD BCD.bak

    3. bcdboot c:Windows /l en-us /s m: /f UEFI

      • Note The /l en-us part of the command sets the Windows language to English. To set a different language, replace en-us with a different language code (such as de-de for German).

  10. Reboot the device – you can do this quickly from the command prompt by typing: shutdown -f -r -t 00 and pressing Enter.

Written by Jane