Thus, you can disconnect all external drives, including printer, keyboard, etc., reboot your computer to check if you can boot your PC normally. Windows might recognize the external drive that connected to your PC as the system boot partition and cause boot issue.
If this way is not working, you can employ more ways presented in the following text. In the beginning, you can leave your computer running overnight to complete disk errors repairing. 5 Solutions for the “Repairing disk errors” problem Restart your computer, and then start Windows 7 from the installation disc or USB flash drive as previously described.Note: To protect your data, you can back up the hard drive without booting Windows before you take measures to eliminate the error. Save the setting changes, and then exit the BIOS. (The USB flash drive might be listed under "Removable devices" or something similar.) Select your DVD drive or USB flash drive as the first startup device. Boot order settings might also be listed under "Advanced settings" or something similar. On the BIOS setup screen, choose the option called "Boot order," or something similar.
If the Windows logo appears, you need to try again by waiting until the Windows logon prompt appears, and then shutting down and restarting your computer again. Usually, you must press a key (such as F2, F12, Delete, Esc) or a key combination immediately after you turn on your computer but before Windows starts. Procedures vary depending on the BIOS manufacturer. On the startup menu, choose "BIOS setup," or "BIOS settings," or something similar. Newer computers often display a startup (or boot) menu. Turn on your computer, insert the Windows 7 installation disc or USB flash drive, and then restart your computer. The BIOS interface is designed for advanced users, and it's possible to change a setting that could prevent your computer from starting correctly. Warning: Be careful when changing BIOS settings.
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