diff --git a/OpenRA.Game/Traits/Player/EvaAlerts.cs b/OpenRA.Game/Traits/Player/EvaAlerts.cs
index 04e9bd2a87..4369ca8a95 100644
--- a/OpenRA.Game/Traits/Player/EvaAlerts.cs
+++ b/OpenRA.Game/Traits/Player/EvaAlerts.cs
@@ -25,6 +25,8 @@ namespace OpenRA.Traits
 		public readonly string BuildingCannotPlaceAudio = "nodeply1.aud";
 		public readonly string UnitSelectAudio = "train1.aud";
 		public readonly string UnitReadyAudio = "unitrdy1.aud";
+		public readonly string UnitReadyBlockedAudio = "nobuild1.aud";
+		
 		public readonly string OnHoldAudio = "onhold1.aud";
 		public readonly string CancelledAudio = "cancld1.aud";
 		public readonly string NewOptions = "newopt1.aud";
diff --git a/OpenRA.Mods.RA/Player/ClassicProductionQueue.cs b/OpenRA.Mods.RA/Player/ClassicProductionQueue.cs
index eb159ebdcb..ab218fdfc0 100755
--- a/OpenRA.Mods.RA/Player/ClassicProductionQueue.cs
+++ b/OpenRA.Mods.RA/Player/ClassicProductionQueue.cs
@@ -46,7 +46,7 @@ namespace OpenRA.Mods.RA
 			return QueueActive ? base.BuildableItems() : None;
 		}
 		
-		protected override void BuildUnit( string name )
+		protected override bool BuildUnit( string name )
 		{			
 			// Find a production structure to build this actor
 			var producers = self.World.Queries.OwnedBy[self.Owner]
@@ -57,7 +57,7 @@ namespace OpenRA.Mods.RA
 			if (producers.Count() == 0)
 			{
 				CancelProduction(name,1);
-				return;
+				return true;
 			}
 			
 			foreach (var p in producers)
@@ -67,9 +67,10 @@ namespace OpenRA.Mods.RA
 				if (p.Trait.Produce(p.Actor, Rules.Info[ name ]))
 				{
 					FinishProduction();
-					break;
+					return true;
 				}
 			}
+			return false;
 		}
 	}
 }
diff --git a/OpenRA.Mods.RA/Player/ProductionQueue.cs b/OpenRA.Mods.RA/Player/ProductionQueue.cs
index f42c640cbe..5629d5ec8f 100755
--- a/OpenRA.Mods.RA/Player/ProductionQueue.cs
+++ b/OpenRA.Mods.RA/Player/ProductionQueue.cs
@@ -145,23 +145,31 @@ namespace OpenRA.Mods.RA
 					if (!BuildableItems().Any(b => b.Name == order.TargetString))
 						return;	/* you can't build that!! */
 				
-					bool hasPlayedSound = false;
-					
 					for (var n = 0; n < order.TargetLocation.X; n++)	// repeat count
 					{
+						bool hasPlayedSound = false;
 						BeginProduction(new ProductionItem(this, order.TargetString, (int)time, cost,
 								() => self.World.AddFrameEndTask(
 									_ =>
 									{
 										var isBuilding = unit.Traits.Contains<BuildingInfo>();
-										if (!hasPlayedSound)
+										var eva = self.World.WorldActor.Info.Traits.Get<EvaAlertsInfo>();
+										
+										if (isBuilding && !hasPlayedSound)
 										{
-											var eva = self.World.WorldActor.Info.Traits.Get<EvaAlertsInfo>();
-											Sound.PlayToPlayer(order.Player, isBuilding ? eva.BuildingReadyAudio : eva.UnitReadyAudio);
+											Sound.PlayToPlayer(order.Player, eva.BuildingReadyAudio);
 											hasPlayedSound = true;
 										}
-										if (!isBuilding)
-											BuildUnit(order.TargetString);
+										else if (!isBuilding)
+										{
+											if (BuildUnit(order.TargetString))
+												Sound.PlayToPlayer(order.Player, eva.UnitReadyAudio);
+											else if (!hasPlayedSound && time > 0)
+											{
+												Sound.PlayToPlayer(order.Player, eva.UnitReadyBlockedAudio);
+												hasPlayedSound = true;
+											}
+										}
 									})));
 					}
 					break;
@@ -233,18 +241,23 @@ namespace OpenRA.Mods.RA
 		}
 
 		// Builds a unit from the actor that holds this queue (1 queue per building)
-		protected virtual void BuildUnit( string name )
+		// Returns false if the unit can't be built
+		protected virtual bool BuildUnit( string name )
 		{			
 			// Cannot produce if i'm dead
 			if (!self.IsInWorld || self.IsDead())
 			{
 				CancelProduction(name, 1);
-				return;
+				return true;
 			}
 			
 			var sp = self.TraitsImplementing<Production>().Where(p => p.Info.Produces.Contains(Info.Type)).FirstOrDefault();
 			if (sp != null && !IsDisabledBuilding(self) && sp.Produce(self, Rules.Info[ name ]))
-					FinishProduction();
+			{
+				FinishProduction();
+				return true;
+			}
+			return false;
 		}
 	}
 
diff --git a/mods/cnc/bits/nobuild1.aud b/mods/cnc/bits/nobuild1.aud
new file mode 100644
index 0000000000..853ef43c7a
Binary files /dev/null and b/mods/cnc/bits/nobuild1.aud differ