So, a friend of mine needed to test an email (SMTP) mail server and was writing something to do this in java when I mentioned that it could be tested via telnet.
Here are some of the commands that I’ve used previously:
Telnet to the mail server on the correct port (by default port 25) e.g. telnet [...]
Recently, I had to go through this process to work out what to do when my friend’s Macbook wouldn’t start.
Here’s a reminder of the things I tried:
Start in Safe Mode. Do this by holding down the Shift key while starting. Release Shift when you see the Apple logo and this spinning thing.
Start in Single User [...]
Continue reading about Troubleshooting a Mac that won’t start