no x auto start, manual possible

hi guys,

when booting x, there appears a small text console in black screen. i have to exit it, then comes the splash login. i have switch to text-console modus for a successful login, otherwise it doesn’t work. then login and starting x is possible without problems, except one: i can’t access usb devices. therefore i got to start x in supervisor mode. so i think i got any security issue but i don’t know where to search. tried several things but no solution at all.

thanks in advance!