Hi,

I have a non 'S' CPU 3500 and 3400 set up which has been working perfectly for many years.

The 'Enable/Disable pages' function on the 3400 has suddenly stopped working. If I set a number of the pages to enable and some to disable on the [EFIS] > [Settings] > [More] menu and then press Save, all is fine whilst the system is powered on and I can scroll through the relevant selected pages.

If however I power down the system at the end of the flight, when I next turn everything on, the 3400 screen locks onto a single page and the Page button will not scroll through any pages. When I access the Enable/Disable page function, all pages have been disabled with the exception of one of them (Page number 7). I can reset this whilst still powered up, but then all resets to a single page when I power down again.

The 3500 works perfectly, only effecting the 3400. I have reloaded the software.

Grateful for any help.