It is normal that the monitor slightly shakes while you adjust the viewing angle.
Connecting the cables
Connect the cables as the following instructions:
•. To.connect.the.power.cord: Connect one end of the power cord securely to
the monitor's AC input port, the other end to a power outlet.
Plug one end of the VGA/DisplayPort/HDMI cable to the monitor's VGA/
Connect the other end of the VGA/DisplayPort/HDMI cable to your
computer's VGA /DisplayPort/HDMI jack.
Tighten the two screws to secure the VGA connector.
•. To.connect.the.audio.cable:.connect one end of the audio cable to the
monitor's Audio-in port, the other end to the computer's audio-out port.
•. To.use.the.earphone: connect the end with plug type to the monitor's
earphone jack when an HDMI/DisplayPort signal is fed.
Upstream: Use the supplied USB Type-B to Type-A cable. Make sure
your computer is installed with the latest Windows 7/Windows 8.1/
Windows 10 operating system. That will enable the USB ports on the
monitor to work.
ASUS PA248QV Series LCD Monitor