There are a lot of ways to fix this problem. This list is far from complete but it will give you just about everything you need to start writing informative articles. 1 - Take a look at your desktop. I bet your readers weren't there and would love to hear about it. There are always interesting topics being discussed in forums as well as many good questions being asked.
Forums are a great place to get ideas for an article.
3 - Take a look at the World around you. You can write about that. Make a special offer that is for your readers only. 4 - Start a Feedback Column. Yes, this one makes it very easy to write.