General :: Custom Bootanimation Don't Work - Black Screen

I wanted to create a simple bootanimation for my HTC Desire. I found a couple of websites explaining pretty much everything from folder structure to the contents of desc.txt, so I started playing around a little bit.

However after pushing my first customized bootanimation to the phone, all I get is a black screen after the initial HTC logo.

I already tried using desc.txt files from different bootanimations that I found on the web. I even extracted and re-zipped a downloaded bootanimation so I could see if that could possibly be the problem. But none could solve my black screen.

At least I think I have narrowed down the problem to the png files I use. My last guess is, that I save those files using the wrong settings.

I use Photoshop CS 5 using the following workflow:

First I create the frames that I want in my animation (just like build a GIF file). The I opened File-->Export-->Render Video. Then I select "Image Sequence", choose PNG, disable interlacing in the settings and finally choose a 480x800 resolution. Alpha channel is set to "None".

After that I use IrfanView to change the image color depth to 24bit and save the files in the part0 folder. None of my files is bigger than 30 KB.

My folder structure looks like this:

part0
-----00001.png
-----00002.png
....
-----00027.png

My desc.txt looks like this:

480 800 30
p 0 0 part0

After zipping the folders and the desc.txt without compression, I push the files to my phone. But when I try to watch it, all I get is a black screen.

I attached my bootanimation.zip. When I download bootanimations from the web, it works just fine.