When I hang-up the system, then the screem is black. But the power light is brightness. and the disk light is bright sometimes. When I press any key, the screem is still black. Only can do is to press down power button for several seconds to power off the notebook. Is there the bug of the Centos? -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20100820/753cc866/attachment-0003.html>