Tech Drive-In posted a tutorial about fixing the restart problem on an Ubuntu 11.04 Core 2 Duo Lenovo laptop with Intel Mobile 4 Series Chipset

Recently, I had to install Ubuntu 11.04 in a Core 2 Duo Lenovo laptop with Intel Mobile 4 Series Chipset. I had previously installed Ubuntu 10.10 in it and it worked flawlessly. But that was not the case when I installed the latest Ubuntu. Though installation went smooth, Ubuntu 11.04 just won't boot after restart and instead a blank screen appears with a blinking cursor. After some amount of browsing, I think I have just found out how to fix the blank screen issue. 

  Howto Fix Ubuntu 11.04 Won't Boot After Restart Problem