thats the most unlikely thing.
1) reboot the unit. sometimes a reboot reads all the chips properly while using the PSU to power on/off causes initial voltage jumps and takes a second to charge all the capacitors.
2) check for anything damaged - primarily the capacitors.
Its usually power related. I had a unit arrive on friday with a capacitor snapped off and when booting via PSU on/off it registers most of the chips as 'x' and/or marks them dead/missing. However, a reboot via the webUI causes the system to initiate will all 32 chips on that board working normally