Welcome to the Community. The Pre Boot System Assessment normally starts when the FN button is pressed down, and you power on the computer. I am sure your not holding down the FN key, but there are chances that the FN key could be stuck. I would suggest to reseat your keyboard, using the below link, if that does not work, contact Dell Technical Support in your region, may need replace the keyboard.
<ADMIN NOTE: Broken link has been removed from this post by Dell>
DELL-Royan S
4 Operator
•
3.8K Posts
1
March 31st, 2011 11:00
Hi Kirindes,
Welcome to the Community. The Pre Boot System Assessment normally starts when the FN button is pressed down, and you power on the computer. I am sure your not holding down the FN key, but there are chances that the FN key could be stuck. I would suggest to reseat your keyboard, using the below link, if that does not work, contact Dell Technical Support in your region, may need replace the keyboard.
<ADMIN NOTE: Broken link has been removed from this post by Dell>
Hope this helps.
Thank you
Royan