Please help with new computer install!

I am installing an Asus A8N-SLI motherboard and having problems. I have everything installed, I boot up the system, no strange beeps, hard drive seems to be running but it gets to the first screen where it says to press delete to enter setup/bios and it just sits there. The keyboard doesn’t work, can’t click shift on the keyboard, I also tried the keyboard on some usb ports and still won’t let me hit delete. any suggestions ?