RedHat 7.0-4.3Gb harddrive-LILO not work

I install Red Hat 7.0 on a 4.3 Gb harddrive, when I boot from the hard drive, the screen display only two work : “LI” and stuck there.
I can boot from floppy disk, however, it take too long. What should I do so that I can boot by my hard drive.

Thank you so much,