Nicholas has a question: Dell laptop won't stop beeping on power up what is causing it?
Some computers won't even let you to access BIOS if the keyboard is disconneced or bad. Actually, I would check if the keyboard is properly connected and check with some other keyboard or test the keyboard on another computer..
Codes are not the same for all Dell models, so go to this webpage, find your model and try interpret the code
Depending on the failure, maybe can help you to solve the problem but first of all you should diagnose it
The final note: We got no further backfeed from Nicholas, not even the thanks for answering him...