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Hi Gallet,
Basically, the “Reboot and Select Proper Boot Device” error shows up when your computer system’s BIOS is having some trouble finding the bootable drive or other bootable devices. To put it another way, the BIOS chip in your computer’s motherboard is not able to recognize the drive where your operating system is installed. You can follow the instructions below to resolve the issue:
Method 1: Checking and fixing problems on your system’s driveThe problem may come from your computer’s OS drive. So, the first thing you have to do is check whether your SDD or HDD is properly connected to your computer. You can easily do this by entering the BIOS settings. With that said, follow the steps below:
Method 2: Using diskpartThe “Reboot and select proper boot device” error can also happen if the computer’s active drive is not configured to be the primary hard drive. You can fix this problem by setting your primary hard drive as the active one. Here are the steps:
select partition X *Change X to the number of your primary partition* active Method 3: Replacing your CMOS batteryYou will find the small, circular CMOS battery in your motherboard. If this cell is damaged or failing, it will cause various problems including the “Reboot and Select Proper Boot Device” error. In this case, you have to open your computer’s casing, access the motherboard, and remove the CMOS battery. Make sure you get rid of any residual charge by holding the Power button for at least 10 seconds. After that, replace the CMOS battery with a new one. Employing this method should fix the error.I hope this helps. Regards, Lokesh |