I got in on a Hot Deal on the Dell SC440 for $223 delivered, sweet box. No OS.
Problem: After I put XP Pro SP2 on it, the power button was doing hard shutdowns.
Fix: I went into Device Manager > System Devices and uninstalled the ACPI Fixed Feature Power Button, which was the first item in my System Devices list. Reboot should be all you need, although I logged off and back on first, then Start Button > Restart
Voila!
Problem: After I put XP Pro SP2 on it, the power button was doing hard shutdowns.
Fix: I went into Device Manager > System Devices and uninstalled the ACPI Fixed Feature Power Button, which was the first item in my System Devices list. Reboot should be all you need, although I logged off and back on first, then Start Button > Restart
Voila!