I am using ThinkPad T61 with Windows Vista and Leopard Dual boot. Leopard works fine but I can't get into Safe mode. During boot up, if I pressed F8, it displays a graphic screen listed every partition on my hard drive (include one for Windows Vista and one for Leopard). But the command prompt which I can enter '-x' to get into the safe mode is gone. How do I get that back?

Thanks!