Then, follow the prompts given by AOMEI Partition Assistant to complete the operation.Īfter setting partition active, remove the bootable device, reboot the computer from system hard drive. In the main console, right-click the boot partition and go to “ Advanced”>“ Set Active Partition”.
Boot your Acer computer from the bootable media made by AOMEI Partition Assistant Standard.Ģ. At this time, you can set the system active to solve it. If the system partition is no longer active, you can also get a message saying cannot find the operating system on Startup. Confirm your operation and click “ Apply”>“ Proceed” to perform it.Īfter 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. Choose a proper MBR type according to your current operating system (Here is Windows 10).ģ. Right-click the disk holding damaged MBR and choose “ Rebuild MBR”.Ģ. After booting successfully, you will access the main interface of AOMEI Partition Assistant automatically.ġ. 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. If you have no way to access Command Prompt, you can turn to AOMEI Partition Assistant Standard to rebuild MBR. Type “ bootrec /fixmbr” and pres s Enter. Go to Troubleshoot > Advanced> Command Prompt.ĥ. In the Install now screen, click Repair your computer.Ĥ. Choos e Langue, Time, and Keyboard input. Boot from Windows installation/repair disk.Ģ. If the issue occurs due to corrupted MBR, you can do as follows to repair damaged MBR via Command Prompt.ġ. If you still get the same error, you can reset the BIOS to default settings. If not, change the connection cable to see if it works. In the BIOS Main Tab, check whether your system disk is detected. Restart the Acer computer and press a certain key to enter BIOS.Ģ. Follow the steps below to check BIOS Settings:ġ. If the issue appears after you adjust the BIOS Settings, the most possible issue can be improper BIOS Settings. ▪ Windows system partition is not marked as active.īased on the events that can account for the warning, you can try one or more of the methods presented in the next context. ▪ The MBR of the system hard drive is damaged ▪ There is something wrong with BIOS Settings. The issue operating system not found or missing operating system in Acer can come up mainly out of the following reasons: Thanks!” The analysis and fixes for operating system not found on Acer
I have no idea what happens and what should I do? I really need your help. “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. Can’t boot Acer: Operating system not found
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