Index: wp-admin/css/install.css
===================================================================
--- wp-admin/css/install.css (revision 22397)
+++ wp-admin/css/install.css (working copy)
@@ -63,6 +63,23 @@
 	border-bottom: none;
 	text-align:center
 }
+#logo a {
+	background-image: url('../images/wordpress-logo.png?ver=20120216');
+	background-size: 274px 63px;
+	background-position: top center;
+	background-repeat: no-repeat;
+	height: 67px;
+	text-indent: -9999px;
+	outline: none;
+	overflow: hidden;
+	display: block;
+}
+@media only screen and (-webkit-min-device-pixel-ratio: 1.5) {
+	#logo a {
+		background-image: url('../images/wordpress-logo-2x.png?ver=20120412');
+		background-size: 274px 63px;
+	}
+}
 .step {
 	margin: 20px 0 15px;
 }
Index: wp-admin/install.php
===================================================================
--- wp-admin/install.php (revision 22397)
+++ wp-admin/install.php (working copy)
@@ -16,7 +16,7 @@
 	<title>Error: PHP is not running</title>
 </head>
 <body>
-	<h1 id="logo"><img alt="WordPress" src="images/wordpress-logo.png?ver=20120216" /></h1>
+	<h1 id="logo"><a href="http://wordpress.org" title="<?php _e( 'WordPress' ); ?>"><?php _e( 'WordPress' ); ?></a></h1>
 	<h2>Error: PHP is not running</h2>
 	<p>WordPress requires that your web server is running PHP. Your server does not have PHP installed, or PHP is turned off.</p>
 </body>
@@ -63,7 +63,7 @@
 	?>
 </head>
 <body<?php if ( is_rtl() ) echo ' class="rtl"'; ?>>
-<h1 id="logo"><img alt="WordPress" src="images/wordpress-logo.png?ver=20120216" /></h1>
+<h1 id="logo"><a href="http://wordpress.org" title="<?php _e( 'WordPress' ); ?>"><?php _e( 'WordPress' ); ?></a></h1>
 
 <?php
 } // end display_header()
Index: wp-admin/upgrade.php
===================================================================
--- wp-admin/upgrade.php (revision 22397)
+++ wp-admin/upgrade.php (working copy)
@@ -58,7 +58,7 @@
 	?>
 </head>
 <body>
-<h1 id="logo"><img alt="WordPress" src="images/wordpress-logo.png?ver=20120216" /></h1>
+<h1 id="logo"><a href="http://wordpress.org" title="<?php _e( 'WordPress' ); ?>"><?php _e( 'WordPress' ); ?></a></h1>
 
 <?php if ( get_option( 'db_version' ) == $wp_db_version || !is_blog_installed() ) : ?>
 
