[CentOS] system reboots after shutdown

Hi all,

When i want to shutdown my laptop (the result is the same from command line as from gdm), screen gets blank, but computer restarts.

APM is disabled (this laptop doesn't support it), and disabling ACPI is no solution, because it controls the fan.

Kernel version is 2.6.9-11.EL and CPU is Pentium Centrino. Laptop is an AIRIS 840.

I use different distros (ubuntu, debian and knoppix) to reproduce this problem without a result.

How can I solve this problem?.

Thank you for your help.

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