Kind of what fourroses666 says. I think you have a "white screen of death" probably some php or settings. Check MODx logs or serverlogs. If you've tangled with htaccess or apache config, doublecheck those directives too.
Maybe config-file too tight? Meaning, system should be able to Read that ;-) Maybe trash cachefiles if coming from a copy with old stuff. Maybe your upload went laggy? Can't hurt to place your configfile outside manager folder and then replace that folder from install-zip. Maybe do assets too while you're at it.
As already mentioned, comment out your own stuff ( with # ) until you'll near the start/end of errors. Every Evo higher than 1.0.9 imo preferably needs php 5.3+ Well, some 5.1.6 of mine left me in the dark once on a 1.0.10 install :-/
To finish, check if you connect to dbase. Maybe some characters in password need escaping when in php string? Check everything

Set your php-errorlogging to the domainspace where your site runs. This gives you (and reachable to others) a per site overview of problems.