Win XP boot fails with black screen

I was trying to reinstal my win XP and had to chance the boot order to prefer cd over hardware, but I acidentally changed it to try boot them at the same time and now when I try powering on my pc, the screen stays black and pc just wont run anything, just shows the FF message on the motherboard wich means its trying to start but nothing will happen. I can’t even get to the CMOS settings and I’ve tried to reset the ccmos with the jumper and by removing the battery but nothing has helped.