Yes i know exactly what that is. This happens when you are in mirage OS and you set that option. What you need to do is take out the batteries when its on or go to mode and press alpha and s (LN) and then it should ask for self check say yes and press enter for like ever. I prefer to take out the batteries Then quickly go to memory and delete the avtar. It should do the trick.

That is MirageOS options. If you have the apps Krolypto or Omnicalc, then it could be the options that were set.