EBME Forums Forums Maintenance Technical Assistance ESPRIT ventilator have fault

Hi all.
I need your help.
I have a ventilator model ESPRIT.
Now, when turn it on, in boost screen there is only striped noise, no data display.
and then in main screen, all data display ok and machine work ok if I don't press any button on touch screen.
But when pressing any button on main screen to change parameter (i.e Patient Data, Alarm setting, Monitor...), this machine restart immediately.
This problem caused by CPU board or MMI board???
Please help me.