please rescue me from my stupidity

Despite the many warnings, I removed the power management (mains plug) and now can only turn computer off at mains switch. Nothing I have tried in the power management/ACPI seems to work, and the message suggests ACPI is missing from the kernel. Is there something simple I have missed to enable me to restore power off at shutdown? Do I need to reload a module? If so how do I permanently reload that module? I do realise I deserve no sympathy. I have checked the list for May and June, I am the only person that appears to have been this stupid. TIA