Possible Duplicate:
Shutdown does not power off computer
I am using Ubuntu 12.04 LTS and I'm getting a serious bug:
When I try to shutdown my system, my screen goes blank but my CPU fan keeps running, i.e. the processor is still working but I am not able to see anything on my screen. I need to power off my machine for a complete shutdown.
I am using a desktop with an Intel P4 processor. I found a solution on the internet involving modifying the GRUB config file. But even after doing so I wasn't able to eliminate the issue.
sudo update-grub
afterwards? – nanofarad Sep 16 '12 at 14:48