Hi, I've installed Centos 6.2 x86_64 on a DELL E6520 and nearly everything works just fine. The only problem is that the system hangs after entering "reboot". I can see that several services get stopped, but after some seconds the screen is just black and nothing happens anymore. The weird thing is that "poweroff" always works just fine. Also, I should note that I'm using the NVIDIA binary graphics driver and have disabled the "Optimus" feature in the BIOS. The problem with "reboot" happens regardless if the NIVIDA driver is installed or not. Any ideas? Best regards, Bernd