[Xmonad] xmonad does not start

Hi, I hope you can help me. I've compiled xmonad step by step as written in manual, but it does not start - after logging in xdm my screen just blink several times (like X restarting - and it restarts, according to log) and shows starting screen again. My distro is ALT Linux (I think this does not matter ;)), GHC 6.6.1, all libraries was installed by distro except X11-extras (which I have installed in my home, just like xmonad itself). Maybe I can provide some more precise information? Just say what I need to tell. Thanks in advance! Hope I'll have possibility to enjoy this great wm. :) -- Alexander