This Instructable will help to make your support experience a little less painful for both you and the rep on the other end of the line.
Step 1: Don't try to fix it yourself!
If, on the other hand, you have a degree of technical expertise and are comfortable* with the device, give it a go! I really do like it when you call in and can show me that you have a good head on your shoulders. Just don't get mad if I ask you to do something you have already tried.
*comfortable, in this case, does not mean you use it daily. I mean that you are able to configure system options or change the settings of the device without referring to the manual. Just because you can push buttons does not mean you know everything about it.