[CentOS] The system is pseudo dead when hang-up system in the centos 5.3 .

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?
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