diff --git a/config.template.h b/config.template.h
index 16f6e86..e0df3d1 100644
--- a/config.template.h
+++ b/config.template.h
@@ -2,6 +2,7 @@
  * Configuration template file, copy it to config.h
  * and make your changes there.
  */
+#define DEBUG true
 #define DB_HOST "localhost"
 #define DB_USER "energy-meter"
 #define DB_PASS ""
@@ -11,6 +12,7 @@
 #define DEBUG_INTERVAL 1000
 #define RECORD_INTERVAL 60000
 #define N_INPUTS 9
+#define LED_PIN 13
 
 int pins[] = {1, 2, 3, 4, 5, 6, 7, 8, 9};
 byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
diff --git a/energy-meter.ino b/energy-meter.ino
index 9059c77..0fea0c9 100644
--- a/energy-meter.ino
+++ b/energy-meter.ino
@@ -19,7 +19,6 @@ unsigned long lastRecord;
 Input inputs[N_INPUTS];
 EthernetClient ethClient;
 MySQL_Connection db((Client *) &ethClient);
-IPAddress dbServer;
 
 void printTitle(String title) {
   #ifdef DEBUG
@@ -29,14 +28,9 @@ void printTitle(String title) {
   #endif
 }
 
-void showError(String error) {
-  #ifdef DEBUG
-    Serial.println(error);
-  #endif
-}
-
 void abortWithError(String error) {
   showError(error);
+  digitalWrite(LED_PIN, HIGH);
   while (true) delay(1);
 }
 
@@ -52,19 +46,20 @@ void setup() {
     while (!Serial);
   #endif
 
+  pinMode(LED_PIN, OUTPUT);
+  printTitle("Initializing");
+
   if (Ethernet.begin(mac) == 0)
     abortWithError("DHCP config failed.");
   if (Ethernet.hardwareStatus() == EthernetNoHardware)
     abortWithError("Eth shield not found.");
-  if (Ethernet.linkStatus() == LinkOFF)
-    abortWithError("Eth cable not connected.");
 
   #ifdef DEBUG
-    Serial.println("IP: " +  String(Ethernet.localIP()));
+    Serial.print("IP: ");
+    Serial.println(Ethernet.localIP());
   #endif
 
-  if (!dbConnect())
-    abortWithError("Aborting.");
+  dbConnect();
 
   unsigned long now = millis();
   lastRefresh = now;
@@ -83,8 +78,27 @@ void setup() {
   #endif
 }
 
+void showError(String error) {
+  digitalWrite(LED_PIN, HIGH);
+
+  #ifdef DEBUG
+    Serial.println(error);
+  #endif
+}
+
 boolean dbConnect() {
+  if (Ethernet.linkStatus() == LinkOFF) {
+    showError("Eth cable not connected.");
+    return false;
+  }
+
+  if (db.connected()) {
+    digitalWrite(LED_PIN, LOW);
+    return true;
+  }
+
   DNSClient dns;
+  IPAddress dbServer;
   dns.begin(Ethernet.dnsServerIP());
 
   if (dns.getHostByName(DB_HOST, dbServer) != 1) {
@@ -93,7 +107,8 @@ boolean dbConnect() {
   }
 
   #ifdef DEBUG
-    Serial.println("Connecting to DB: " + String(dbServer));
+    Serial.print("Connecting to DB: ");
+    Serial.println(dbServer);
   #endif
 
   if (!db.connect(dbServer, DB_PORT, DB_USER, DB_PASS)) {
@@ -101,6 +116,7 @@ boolean dbConnect() {
     return false;
   }
 
+  digitalWrite(LED_PIN, LOW);
   return true;
 }
 
@@ -143,9 +159,7 @@ void loop() {
 
   if (millis() - lastRecord > RECORD_INTERVAL) {
     printTitle("Recording to DB");
-
-    if (!db.connected())
-      dbConnect();
+    dbConnect();
 
     for (int i = 0; i < N_INPUTS; i++) {
       refreshTimers();