diff --git a/monitor/system.cpp b/monitor/system.cpp
index 4c30f9f..44da0ba 100644
--- a/monitor/system.cpp
+++ b/monitor/system.cpp
@@ -48,11 +48,18 @@
         bus, std::bind(std::mem_fn(&System::powerStateChanged), this,
                        std::placeholders::_1))),
     _thermalAlert(bus, THERMAL_ALERT_OBJPATH)
-{
+{}
 
+void System::start(
+#ifdef MONITOR_USE_JSON
+    const std::string& confFile
+#endif
+)
+{
+    _started = true;
     json jsonObj = json::object();
 #ifdef MONITOR_USE_JSON
-    jsonObj = getJsonObj(bus);
+    jsonObj = fan::JsonConfig::load(confFile);
 #endif
     // Retrieve and set trust groups within the trust manager
     setTrustMgr(getTrustGroups(jsonObj));
@@ -61,20 +68,10 @@
     setFaultConfig(jsonObj);
     log<level::INFO>("Configuration loaded");
 
-    // Since this doesn't run at standby yet, powerStateChanged
-    // will never be called so for now treat start up as the
-    // pgood.  When this does run at standby, the 'atPgood'
-    // rules won't need to be checked here.
     if (_powerState->isPowerOn())
     {
         std::for_each(_powerOffRules.begin(), _powerOffRules.end(),
                       [this](auto& rule) {
-                          rule->check(PowerRuleState::atPgood, _fanHealth);
-                      });
-        // Runtime rules still need to be checked since fans may already
-        // be missing that could trigger a runtime rule.
-        std::for_each(_powerOffRules.begin(), _powerOffRules.end(),
-                      [this](auto& rule) {
                           rule->check(PowerRuleState::runtime, _fanHealth);
                       });
     }
@@ -202,8 +199,18 @@
 
 void System::powerStateChanged(bool powerStateOn)
 {
+    std::for_each(_fans.begin(), _fans.end(), [powerStateOn](auto& fan) {
+        fan->powerStateChanged(powerStateOn);
+    });
+
     if (powerStateOn)
     {
+        if (!_started)
+        {
+            log<level::ERR>("No conf file found at power on");
+            throw std::runtime_error("No conf file fount at power on");
+        }
+
         std::for_each(_powerOffRules.begin(), _powerOffRules.end(),
                       [this](auto& rule) {
                           rule->check(PowerRuleState::atPgood, _fanHealth);