Shutdown problems with 7.2

Hello, I am running SuSE 7.2 on an iwill kk266 board (with an Athlon 1.333) -- the sytem runs quite nicely but I have one odd problem: when I power the sytem down it does not turn the power off -- the system runs through all the shutdown scripts and halts, but will not power off. Is this related to a setting within SuSE or is this perhaps related to a BIOS setting? On a related note, one of my other systems was running win98 -- when I shutdown it would power off automatically. I upgraded the system to win2k and now it does not automatically power off either. Any suggestions? Thanks, Dominic