In some examples, the electronic device 1 may include a proximity sensor (not illustrated). The proximity sensor may detect a position of the mechanical linkage 651, or some other part of the engagement mechanism 650. This information may be used by a system controller, such as a BMC or other controller, to determine whether or not to fully power on the pluggable modules 700. For example, the pluggable modules 700 may be partially powered on responsive to establishing an electrical connection with the connector 602, to enable performance of management functions like discover, configuration, authentication, etc. However, the cold pluggable modules may be prevented from being fully powered on until the cold plate engagement mechanism 650 is actuated, to prevent the modules 700 from overheating.

In some examples, the electronic device 1 may include an electrically actuated locking mechanism 668, as illustrated in FIGS. 16A and 16B. The locking mechanism 668 may prevent the mechanical linkage 651 from moving unless released. This may be used to prevent modules 700 from being removed from the bay 600 without the permission of the computing device 1, improving physical security. The locking mechanism 668 may also prevent actuation of the engagement lever 655 to engage the cold plate 630 until certain criteria are met. For example, the locking mechanism 668 may prevent engagement of the cold plates 630 until all of the modules 700 have been properly installed (e.g., electrically connected to the connectors 602). Control circuitry 800 may control the locking mechanism 668. The description in section 1.3 related to determining whether modules 700 have been installed is equally applicable in this context.