Computer won't turn off stuck on logging off page

Hello,

I tried to turn my Dell Inspiron 1525 laptop off yesterday and it stuck on the "logging off" page. If I hold down the power button, then it shuts down, but when I start it back up again, it just goes right back to the "logging off" page. I tried holding down F8 (to start in safe mode) right after turning it back on, but it just made a loud beeping sound and didn't do it. People with similar problems recommend stuff like virus scans and driver updates, but I can't do any of this because the computer won't start! (Even right now I am using a different computer.)
Does anyone know what I can do to fix this?
Thanks!
Alice