Okay, There can be a number of issues. I'll give you the most common.
1. Did you check for an Apple Software Update. (General not the specific Drivers)
2. Are you running Snow Leopard or Leopard. If its Snow Leopard most likely the Manufacture in this case Samsung and Apple haven't released the fixed version for it. I'm running snow leopard and my Canon Pixma wasn't working for about a week wireless because of this.
3. Try an Automatic Setup. Go to System Preferences, then Print&Fax, then underneath the box that lists the installed printers if any are there click the Plus ➕ , Then check if your printer is listed. If it is highlight it then follow the instructions. If you have any other questions feel free to contact me. Good Luck.
Source(s):
https://answers.yahoo.com/question/index?qid=20091016195923AAB40uM