PC not rebooting .

I have a AMD Athlon XP-1600 with K7s5a mob.
since I formatted my hard drive, removing 98se,
and installing win2k my pc shuts down fine ,
but , when I try to turn it back on or even try
to reboot , nothing happens , I must kill power
numerous times and keep trying to reboot
before it will boot up . I have AMIbios .