x11 server not initializing

hello …
In a overzealous attempt to configure my desktop… i am somehow lost the interface now when i boot the system…it properly boots but shows a blank screen after dat … i was trying to reintilase the x11 server by
init 3
sax2 -r -m 0=vesa
init 5
but dis wont work on falisafe mode…
help…

actually when i initialize x11 server …
i set the screen resolution that suits my screen(15’’&1024*768)… but once i switch to runlevel 5 …
x11 server increases my screen resolution to higher level
n my monitor goes out of range