Abstract: Diagnostic to identify power consumption of devices present on a target terminal. In either an automatic or manual mode, the target terminal sets the devices to operate at defined power levels and measures the power consumption of the device at that level. The target terminal reports the power consumption to a master terminal. The diagnostic permits system operators to identify failing devices or drivers from a central, master terminal 100. In a monitoring mode, the present invention permits a system operator to audit power state changes of devices in a target terminal 200 during normal operation. By following each event in the monitoring mode, a system operator may identify possibly inconsistent power management techniques in two or more applications running on the target terminal.