Must remove 2 screw:

1) bottom-left (little head, long shaft)

"2) upper-left (big head, short shaft)

for remove motherboard

Same precisation of Phil Howard! Please attention at that flat-flex, raise flat before remove machine top!!!!!

It’s necessary remove olso other little screw positioned on the orange screw ;)

Perfect Comment of Phil Howard! In this moment is necessary remove other screw positioned upper-right