Ok you have either found the xorg log or the output
from failing X startup.
(ww)****INVALID IO ALLOCATION**** b:0x14e0
(EE) VESA (0) No matching modules
(EE) Screen9s0 found but none have usable configuration
Fatal server error
No screens found
X10 fatal IO error 104
First vesa did you try this is quotes "vesa" ?
Were you getting this error before?
If not return the Driver section to what it was.
How about the output of:
cat /etc/X11/xorg.conf | grep Modes
An area to analize are the EE warnings.
This might help get that information:
cat /var/log/Xorg.0.log | grep EE