Why can't I go to system settings?

While trying to get into system setting on the DSi, I come to a screen that says, "An error has occurred. Press and hold the Power Button to turn the system off. Please see the Nintendo DSi Operations Manual for help troubleshooting."

The response in the operations manual says, "Turn the power off for a moment and then turn it back on. Repeat whatever you did that caused the error to occur. If the same message appears, the system must be inspected. - Turn the power off, and contact Nintendo Customer Service."

After 45 mins on the phone explaining the problem, Customer service wanted me to send my system in for repair. I want to know if there is an alternate solution that I can try to get my system fixed without sending my DSi through the Mail. Basically I want to fix it myself.