Philips V24CT User's Reference Manual page 66

Setting up the Monitor (V24 and V26 only)
Warning Warning
Connecting the Philips monitoring network (SDN) cable when the
product is powered on is not supported. Error codes and Philips
monitoring network (SDN) interface lock-up may occur. Power cycling
the product will recover the product. No permanent damage will result.
To prevent unintentional disruption in monitoring, be sure the SDN
interface cable is properly secured at both ends when connecting to the
Philips monitoring network (SDN).
2-4 Getting Started
4. Switch on the system using the power On\Off switch. A self test is
then performed.