1: well, how much memory do you have in there now?
Check page 6 in the motherboard manual:
http://www.sonido-7.com/d8b/files/CB50- ... Manual.pdf2:
The flashing question mark indicates that word clock of the d8b is set as "slave", but it isn't getting word clock sync from another device.
You can change it back to "master":
go to Setup (bottom of the main window), In that window go to the tab "Digital I/O". In the bottom left there's a drop down menu for the word clock. Change it to "internal".