can't turn off automatically

["Ody" <ody inf its-sby edu>]

hello redhat-list redhat com,
after compiling the standard redhat9's kernel, I find out that my cpu(ATX)
can't turn off automatically. Even if I(root) type "poweroff" or click
"shutdown down computer" in X, RH always display
"Halting system....."
"<6> flushing ide devices: hda hdc"
"Shutting down I2O system, it could take a few minutes if there aremany
devices attached "
"I2O system down"
"power down"

please, tell me something I've left in kernel configuration

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Ody