These external devices include: printers, scanners, media card readers, small media cradles (iPod, PDA, MP3 player, etc.), digital cameras and video recorders, USB storage devices, CDs or DVDs from all optical drives, docking station, etc. Therefore, please remove these devices to see whether the problem is solved. Have you connected some external devices to your PC? Have you added or replaced some hardware components in your PC? It's also possible that the 'Windows 7 won't boot' problem is caused by these devices, if these devices are incompatible with your PC and interfere with the normal boot process of Windows.

Remove External Devices and Newly Installed Components When the 'computer won't boot Windows 7' issue happens to you, you can try the following methods to solve your problem. Some hardware components (for example, two different RAM cards) are incompatible with one another.Some hardware components (like PSU, motherboard, etc.) are broken down.The causes of these problems are classified into 2 categories: hardware issue and software issue. In general, when Windows won't boot, its means that the computer will not respond or the PC gets black screen or blue screen error. Fortunately, in this post, MiniTool will offer 11 solutions to you and you can try them one by one. What to do if Windows 7 won't boot? If you are still using Windows 7 PCs, you should know how to fix this problem.

Windows 7 startup repair command prompt