Asus T4-P5P43 - Manual (Page 24)

2-4 Chapter 2: Basic installation
2.4 Power supply unit
You need to turn over the power supply unit (PSU) section on the side before you
can install a central processing unit (CPU) and other system components.
To turn over the PSU:
1. Lay the system chassis on
its side on a flat and stable
surface.
2. Locate and remove the two
screws that secures the PSU to
the chassis.
3. Lift the PSU in the direction of
the arrow to a 90º angle.
When removing the PSU, ensure to hold or support it firmly. The unit may
accidentally drop and damage other system components.