ok the problem was I
i gave all directories permission according to
http://svn.modxcms.com/docs/display/revolution/Fresh+Installation AND I misunderstood "4. Create a blank file "/core/config/config.inc.php" and make it writable." so I renamed /core/config/config.inc.tpl to /core/config/config.inc.php (WRONG DONT DO THAT!!!!)
One reason is because I’m so used to rename config.inc.tpl from MODx Evolution.
conclusion:
(for those who didn’t read the whole thread, this is installing traditional modx revolution on a shared host with no shell access, and my initial problem was the installation process stopped with a blank page)
1. just upload all the files. (don’t change any permission yet)
2. browse to /setup/
3. a warning will appear "Fatal error. Make sure your /core/cache directory exists and is writable by the PHP process.", so give /core/cache write access
4. follow the installation process, it will tell you later which directories have to have write-permission.
5. that’s it!
thank Jason for helping on IRC and for your patience!
cheers eni
btw. have nice modxpdo everybody!!!