diff --git a/service/screenblank.lua b/service/screenblank.lua
index 74f18da..af9f867 100644
--- a/service/screenblank.lua
+++ b/service/screenblank.lua
@@ -1,21 +1,25 @@
 local lastkey = computer.uptime()
 local state = true
 local delay = 60
-while true do
- tEv = {coroutine.yield()}
- if tEv[1] == "key_down" then
-  lastkey = computer.uptime()
-  if not state then
-   for addr in component.list("screen") do
-    component.invoke(addr,"turnOn")
+function start()
+ return os.spawn(function()
+  while true do
+   tEv = {coroutine.yield()}
+   if tEv[1] == "key_down" then
+    lastkey = computer.uptime()
+    if not state then
+     for addr in component.list("screen") do
+      component.invoke(addr,"turnOn")
+     end
+     state = true
+    end
+   end
+   if computer.uptime() > lastkey + delay and state then
+    for addr in component.list("screen") do
+      component.invoke(addr,"turnOff")
+    end
+    state = false
    end
-   state = true
-  end
- end
- if computer.uptime() > lastkey + delay and state then
-  for addr in component.list("screen") do
-    component.invoke(addr,"turnOff")
   end
-  state = false
- end
+ end,"screenblank")
 end