diff --git a/platform/platform-impl/src/com/intellij/util/Restarter.java b/platform/platform-impl/src/com/intellij/util/Restarter.java
index 63208183fee8..a33019b64113 100644
--- a/platform/platform-impl/src/com/intellij/util/Restarter.java
+++ b/platform/platform-impl/src/com/intellij/util/Restarter.java
@@ -21,6 +21,8 @@ import com.intellij.ide.actions.CreateDesktopEntryAction;
 import com.intellij.jna.JnaLoader;
 import com.intellij.openapi.application.PathManager;
 import com.intellij.openapi.diagnostic.Logger;
+import com.intellij.openapi.util.AtomicNotNullLazyValue;
+import com.intellij.openapi.util.NotNullLazyValue;
 import com.intellij.openapi.util.SystemInfo;
 import com.intellij.openapi.util.io.FileUtilRt;
 import com.intellij.openapi.util.text.StringUtil;
@@ -43,24 +45,62 @@ public class Restarter {
   private Restarter() { }
 
   public static boolean isSupported() {
-    if (SystemInfo.isWindows) {
-      return JnaLoader.isLoaded() &&
-             new File(PathManager.getBinPath(), "restarter.exe").exists();
-    }
+    return ourRestartSupported.getValue();
+  }
 
-    if (SystemInfo.isMac) {
-      return getMacOsAppDir() != null &&
-             new File(PathManager.getBinPath(), "restarter").canExecute();
-    }
+  private static final NotNullLazyValue<Boolean> ourRestartSupported = new AtomicNotNullLazyValue<Boolean>() {
+    @NotNull
+    @Override
+    protected Boolean compute() {
+      String problem;
 
-    if (SystemInfo.isUnix) {
-      return UnixProcessManager.getCurrentProcessId() > 0 &&
-             CreateDesktopEntryAction.getLauncherScript() != null &&
-             new File(PathManager.getBinPath(), "restart.py").canExecute() &&
-             PathEnvironmentVariableUtil.findInPath("python") != null;
-    }
+      if (SystemInfo.isWindows) {
+        if (!JnaLoader.isLoaded()) {
+          problem = "JNA not loaded";
+        }
+        else {
+          problem = checkRestarter("restarter.exe");
+        }
+      }
+      else if (SystemInfo.isMac) {
+        if (getMacOsAppDir() == null) {
+          problem = "not a bundle: " + PathManager.getHomePath();
+        }
+        else {
+          problem = checkRestarter("restarter");
+        }
+      }
+      else if (SystemInfo.isUnix) {
+        if (UnixProcessManager.getCurrentProcessId() <= 0) {
+          problem = "cannot detect process ID";
+        }
+        else if (CreateDesktopEntryAction.getLauncherScript() == null) {
+          problem = "cannot find launcher script in " + PathManager.getBinPath();
+        }
+        else if (PathEnvironmentVariableUtil.findInPath("python") == null) {
+          problem = "cannot find 'python' in PATH";
+        }
+        else {
+          problem = checkRestarter("restart.py");
+        }
+      }
+      else {
+        problem = "unknown platform: " + SystemInfo.OS_NAME;
+      }
 
-    return false;
+      if (problem == null) {
+        return true;
+      }
+      else {
+        Logger.getInstance(Restarter.class).info("not supported: " + problem);
+        return false;
+      }
+    }
+  };
+
+  private static String checkRestarter(String restarterName) {
+    File restarter = new File(PathManager.getBinPath(), restarterName);
+    return restarter.isFile() && restarter.canExecute() ? null : "not an executable file: " + restarter;
   }
 
   public static void scheduleRestart(@NotNull String... beforeRestart) throws IOException {