Everybody with a computer has experienced this - sometimes regularly.
It doesn't work today. It did yesterday. What now?
Is this funny? I think so; if you have any sense of humour, or are experienced in troubleshooting, you'll probably agree. That doesn't make it totally irrelevant. Sometimes, humour is based on truth.
Experience is a hard way to learn, but sometimes, it's the best way. If you need more insightful instruction, see Solving Network Problems - A Tutorial
If you make mistakes with your computer, you're using your computer. If you don't make mistakes, you have a computer.