5.4. Troubleshooting Boot Issues
If Windows 7 won't start, it's not very useful. Thankfully, you have several tools you can use to help troubleshoot different boot issues. You've already read about the most valuable tool, Startup Repair in the WinRE. However, you do have some other tools available.
5.4.1. Understanding the Boot Phases
When troubleshooting boot issues, it's important to understand the different phases of the boot process for Windows 7. With an understanding of the different phases, you'll have a better idea of what method to use to resolve the problem. The different phases are
Power On Self Test
Initial startup phase
Windows Boot Manager phase
Windows Boot Loader phase