Can you verify that in /etc/X11 isn't there a xorg.conf file, if there is then 
rename it as xorg.conf.old
If you want can also try the most advanced kernel from:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.37-rc7-natty/
following the same procedure
Thanks
fabio

** Description changed:

+ ***Fixed in Natty***
+ 
  On Lenovo a300 ideacentre ( IC2Duo, Intel MHD4500 graphics ) Ubuntu
  10.10. After upgrade from 10.04 to 10.10 black screen occurs. grub
  invisible, desktop invisible. system is running at background on kernel
  2.6.35.23-generic. If older kernel 2.6.32.-26 is booted , system is
  running normally.

** Changed in: linux (Ubuntu)
       Status: Incomplete => New

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https://bugs.launchpad.net/bugs/692471

Title:
  black screen after upgrade from 10.04 to 10.10 , Lenovo a300 ideacentre

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