Are you trying to view the boot image in your desktop browser? If so, I would visit your site on an iOS mobile device and add the application to my desktop. When you open it, you should see a splash screen.
The screensaver is also complicated with various screen sizes. You can use the following code to make sure it works.
<link href="apple-touch-icon-57x57.png" sizes="57x57" rel="apple-touch-icon">
<link href="apple-touch-icon-72x72.png" sizes="72x72" rel="apple-touch-icon">
<link href="apple-touch-icon-114x114.png" sizes="114x114" rel="apple-touch-icon">
<link href="apple-touch-icon-144x144.png" sizes="144x144" rel="apple-touch-icon">
<link href="apple-touch-startup-image-320x460.png" media="(device-width: 320px)" rel="apple-touch-startup-image">
<link href="apple-touch-startup-image-640x920.png" media="(device-width: 320px) and (-webkit-device-pixel-ratio: 2)" rel="apple-touch-startup-image">
<link href="apple-touch-startup-image-768x1004.png" media="(device-width: 768px) and (orientation: portrait)" rel="apple-touch-startup-image">
<link href="apple-touch-startup-image-748x1024.png" media="(device-width: 768px) and (orientation: landscape)" rel="apple-touch-startup-image">
<link href="apple-touch-startup-image-1536x2008.png" media="(device-width: 1536px) and (orientation: portrait) and (-webkit-device-pixel-ratio: 2)" rel="apple-touch-startup-image">
<link href="apple-touch-startup-image-2048x1496.png" media="(device-width: 1536px) and (orientation: landscape) and (-webkit-device-pixel-ratio: 2)" rel="apple-touch-startup-image">
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http://ticons.fokkezb.nl/