[SLE] Power down after bootup

It seems that I have sucessfully installed SUSE. However, when I boot it after a while the boot process seems to succeed but then the computer powers off. In the manual there appears to be a different install process relating to power problems. Should I use the "Installation - ACPI disabled" option? Can I just do this inasmuch as SUSE is already installed? There is another option "Installation - Local APIC disabled" but no explanation of what this is. What do APCI and APIC stand for? The install also did not detect my wireless interface. I assume I can get that set up once SUSE boots up properly. Thanks! Doug