Make Sure All Your Software is Up to Date
Sometime installing a new operating system on your computer can bring some problems along with all of the great new features. This is definitely a possibility after installing Lion on your Mac. Here are some troubleshooting tips to try out to help get your printer working properly again.
Before you do any of the below suggestions the first thing you should do is check the connections on your printer. Make sure the cable to the printer is connected and make sure the cable from the printer to the computer is connect. While checking cables it might not be a bad idea to try a new cable from the printer to the computer. Also make sure the printer powers on.
If you have a second Mac you might want to try the printer on that one to make sure it is still working properly and hasn't coincidentally had something go wrong with it at the same time you installed Lion.
Once you have done a cable and power check it is time to look into is making sure your software is up to date. The easiest way to do this is running Software Update from the Apple Menu. If you are lucky you will see printer driver updates for your printer's brand in the list of available updates. If so, there is a good chance your printer will be working after installing the updates. If there were no updates on the first try, try again. Sometimes there are updates to software that require certain updates be installed first. As a result, further updates might appear after installing the first batch. Confused? Basically, run software update until no further updates appear for installation.
If running software update does not work, check the website of the company that makes your print for any updated and Lion compatible drivers. If they are there, download and install those updated drivers.
Even if you are not required to restart your computer after installing any of the above updates, I highly recommend it. It is a few extra minutes that can help save you from wasting a lot more.