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reboot and select proper boot device
or insert boot media in selected boot device and press a key
=======造成的原因：
The causes for this error might be any of the following:
Incorrect boot order. Your hard disk (HDD) must be listed in your computer’s boot order
Legacy mode activated or disabled on UEFI-based computers. If your Windows 8, for example, was installed and the UEFI Legacy mode was deactivated, the “Reboot and select proper Boot Device” error might appear
Hard disk failure – see Fix #2 for steps on how to check if your hard disk has failed or is failing
Partition not set as active – see Fix #4
翻译：
引导顺序不正确。您的硬盘（HDD）必须列在计算机的启动顺序中
在基于UEFI的计算机上激活或禁用旧模式。例如，如果安装了Windows 8，并且UEFI传统模式已停用，则可能会出现“重新启动并选择正确的启动设备”错误
硬盘故障–有关如何检查硬盘故障还是发生故障的步骤，请参阅修复#2。
分区未设置为活动分区-请参阅修复＃4
=======
解决：
Cause 1: Incorrect boot order
The most cmmon cause of this error is an incorrect boot order in BIOS. When a PC is trying to boot from an incorrect source, this error screen is displayed.
Cause 2: Partition not set as active
Another possible cause is a partition that is set as inactive. This may happen after disk write errors, power outages or virus attacks.
Fixing “Reboot and select proper Boot Device” on Windows
Windows Setup CD/DVD Required!
Some of the solutions below require the use of the Microsoft Windows setup CD or DVD. If your PC did not come with a Windows installation disc or if you no longer have your Windows setup media, you can use Easy Recovery Essentials for Windows instead. EasyRE will automatically find and fix many problems, and can also be used to solve this problem with the directions below.
Fix #1: Check Boot Order
The most easiest fix for the “Reboot and select proper Boot Device” error is to make sure your computer’s boot order correctly list your hard disk as 1st option.
To check the boot order, follow these steps:
Restart your computer
Press the necessary key to open BIOS menu. This key depends on your computer manufacturer and computer model.This is usually listed on the first screen that appears on your monitor. It can be any of the following: Esc, Del, F2, F8, F10 or F12.If your screen shows multiple keys, find the key to open “BIOS”, “setup” or “BIOS menu”. The boot order is changed from here.
请点击输入图片描述
Notice the key guide in the top-right corner.
Go to the Boot tab
Change the boot order and list your computer’s HDD first
Boot Selection Menu
Save the settings
Restart your computer
Download Easy Recovery Essentials
Burn the ISO Image. Follow our instructions on how to burn a bootable ISO image. If you’d like to have a recovery USB instead, follow our instructions on how to make a recovery USB.
Boot into Easy Recovery Essentials
Select Automated Repair
Click Continue and wait for the Automated Repair process to finish. Automated Repair process will report any issues found with your hard disk or RAM memory:
Restart your computer
Open the UEFI menu by pressing the necessary key. This depends on your computer manufacturer and is listed on the first screen that appears on your computer. It can be any of the following: F2, F8, F12 or the Del key.
Notice the key guide in the top-right corner.
Switch off the Legacy option. Depending on your computer model, this can be listed at the Security tab > Legacy Support.
ThinkPad UEFI-Legacy Boot Priority
Save the settings
Exit UEFI menu
Restart your computer
Fix #2: Check if the hard disk has failed
To test if your hard disk is failing or it’s already failed, use Easy Recovery Essentials’ Automated Repair. Automated Repair process will report any issues found with your hard disk or RAM memory:
To download Easy Recovery Essentials, click here.
Fix #3: Disable Legacy Boot (UEFI only)
On computers that have UEFI instead of BIOS, having the Legacy mode option active could cause the “Reboot and select proper Boot Device” error to appear.
If that’s the case, you can simply disable the Legacy mode and restart your computer:
