While starting up your computer, you may be greeted with an error screen that prevents you from starting your operating system or doing anything for that matter. The "reboot and select proper boot device" error message indicates that your system's basic input/output system (BIOS) is unable to find your operating system's boot device. UEFI requires that you restart the computer, enter he BIOS and choose the correct boot device with the operating system for the computer to boot from, depending on the cause of the error message. Hardware, as well as software issues, can lead to this error message. So, let's look at the various solutions to know how to fix "Reboot and Select Proper Boot Device" error message. Solutions to Resolve "Reboot and Select Proper Boot Device" Error Message By taking the corresponding measure outlined below, you will save a lot of time if you know the exact reason this error occurred. Follow the following steps. Check the Boot Sequence Checking your PC's boot sequence will be one of the most effective ways to resolve the problem. Here's how you can do so:
Examine the Power Cable Connecting your Hard Drive Disk The power cable will not be detected by the computer when it is damaged, frayed, or disconnected. If your hard drive cannot be detected by the computer, likely, the hard drive is not working. Follow these steps to check the power cable.
Set BIOS to Best Defaults The problem may be, even though this solution is a long shot, that your BIOS is not set to its defaults, which can sometimes cause instability, and that instability may be what causes the error message "reboot and select proper boot device." The process is as simple as rebooting your PC and launching the BIOS, and selecting "load optimal defaults." Once it is loaded, restart the PC. Run Diskpart The select proper boot device error may appear if your main partition isn't set as active. To resolve this issue, you'll need to use diskpart to revert your partition to active status. You must have your original Windows installation media to perform this action. Below are the steps you need to follow:
Using the above solutions may resolve the issue. If this doesn't work, check your SATA drivers using Safe Mode. If the problem persists, replace your motherboard's CMOS battery, which may contain errors. You might also need to reinstall Windows if you suspect that your operating system is corrupted or that the boot drive is damaged, corrupted, or dead.
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