Q: 10.11.1 issues on startup

Hi kentalk, it helps if you describe what you've seen because "startup issues" can mean countless possibilities.

Try booting with verbosity on so you can watch what is happening during startup. If you have a camera you can take snapshots/video of the output.

Use these steps to start up your Mac in single-user mode or verbose mode:

1. Shut down your Mac.
2. Press the power button to start up your Mac.
3. Immediately hold down the following keys:

• Hold down Command-S for single-user mode.
• Hold down Command-V for verbose mode.

Source:

How to start up your Mac in single-user or verbose mode - Apple Support