System not rebooting for 30minutes after switch...

Question

I am using a RADEON X1950 super AGP card with my LENOVO dual core 2.8GHZ system.When I switch off the the system and then switch ON the system is not booting even the bias is not executed for 30minutes. But if switched ON after 30 minutes it boots normally, otherwise no problem.When I remove the AGP card it boots normally.Please suggest a solutionM.Sukumar