diff --git a/src/main/scala/li/cil/oc/common/entity/Drone.scala b/src/main/scala/li/cil/oc/common/entity/Drone.scala
index 8f9933dcf..385b13856 100644
--- a/src/main/scala/li/cil/oc/common/entity/Drone.scala
+++ b/src/main/scala/li/cil/oc/common/entity/Drone.scala
@@ -186,7 +186,13 @@ class Drone(world: World) extends Entity(world) with MachineHost with internal.D
 
   override def isPaused: Boolean = machine.isPaused
 
-  override def start(): Boolean = machine.start()
+  override def start(): Boolean = {
+    if (world.isRemote || machine.isRunning) {
+      return false
+    }
+    preparePowerUp()
+    machine.start()
+  }
 
   override def pause(seconds: Double): Boolean = machine.pause(seconds)
 
@@ -487,7 +493,6 @@ class Drone(world: World) extends Entity(world) with MachineHost with internal.D
         }
       }
       else if (!world.isRemote && !machine.isRunning) {
-        preparePowerUp()
         start()
       }
     }
diff --git a/src/main/scala/li/cil/oc/server/component/NetworkCard.scala b/src/main/scala/li/cil/oc/server/component/NetworkCard.scala
index cb22733b4..e2a819dd5 100644
--- a/src/main/scala/li/cil/oc/server/component/NetworkCard.scala
+++ b/src/main/scala/li/cil/oc/server/component/NetworkCard.scala
@@ -173,16 +173,18 @@ class NetworkCard(val host: EnvironmentHost) extends AbstractManagedEnvironment
       }
       // Accept wake-up messages regardless of port because we close all ports
       // when our computer shuts down.
-      packet.data match {
-        case Array(message: Array[Byte]) if wakeMessage.contains(new String(message, Charsets.UTF_8)) =>
-          node.sendToNeighbors("computer.start")
-        case Array(message: String) if wakeMessage.contains(message) =>
-          node.sendToNeighbors("computer.start")
-        case Array(message: Array[Byte], _*) if wakeMessageFuzzy && wakeMessage.contains(new String(message, Charsets.UTF_8)) =>
-          node.sendToNeighbors("computer.start")
-        case Array(message: String, _*) if wakeMessageFuzzy && wakeMessage.contains(message) =>
-          node.sendToNeighbors("computer.start")
-        case _ =>
+      val wakeup: Boolean = packet.data match {
+        case Array(message: Array[Byte]) if wakeMessage.contains(new String(message, Charsets.UTF_8)) => true
+        case Array(message: String) if wakeMessage.contains(message) => true
+        case Array(message: Array[Byte], _*) if wakeMessageFuzzy && wakeMessage.contains(new String(message, Charsets.UTF_8)) => true
+        case Array(message: String, _*) if wakeMessageFuzzy && wakeMessage.contains(message) => true
+        case _ => false
+      }
+      if (wakeup) {
+        host match {
+          case ctx: Context => ctx.start()
+          case _ => node.sendToNeighbors("computer.start")
+        }
       }
     }
   }
diff --git a/src/main/scala/li/cil/oc/util/InventoryUtils.scala b/src/main/scala/li/cil/oc/util/InventoryUtils.scala
index 326c923dc..319be11d4 100644
--- a/src/main/scala/li/cil/oc/util/InventoryUtils.scala
+++ b/src/main/scala/li/cil/oc/util/InventoryUtils.scala
@@ -135,7 +135,8 @@ object InventoryUtils {
     (!stack.isEmpty && limit > 0 && stack.getCount > 0) && {
       var amount = stack.getMaxStackSize min stack.getCount min limit
       inventory.extractItem(slot, amount, true) match {
-        case extracted: ItemStack =>
+        case simExtracted: ItemStack =>
+          val extracted = simExtracted.copy
           amount = extracted.getCount
           consumer(extracted)
           if(extracted.getCount >= amount) return false