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for power management by the OS to work, your bios has to support either APM or ACPI, or both.
and yes, from Norm's article, the Hardware Abstraction Layer (HAL), has to support power management. in device manager, you're compter will either be listed as ACPI Uniprocessor PC, Standard PC, or another for APM PC that I don't know because I've never seen it. You can manually change the driver for computer through device manager, but it's a 50/50 chance of XP booting again, and if it does, you'll have to reinstall every piece of hardware's drivers.
you're better off making sure that APM or ACPI is enabled in the BIOS, booting off the XP cd, going through the install, and choosing to repair your install (not the one for the recovery console, the other one), and then it should do it from there out
edit: yeah, if it's listed as standard pc, then xp didn't detect it as having support for either APM or ACPI, that's why standby and hibernate won't work, and probably why you have to manually push the power button to cut off the machine too :P
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