8 Bips definitivamente tem a ver com o monitor não funcionando corretamente. Como você ainda não mencionou isso, o monitor está fisicamente quebrado ou simplesmente "não está funcionando"? Se não estiver fisicamente quebrado, provavelmente só tem um cabo solto. A julgar pela quantidade de postagens sobre isso, pode ser um problema comum com esse modelo, como você pode ver abaixo.
Encontrei um tópico da Comunidade da Dell sobre este tópico com alguns métodos mencionados que você poderia tentar se você quiser.
Aqui estão algumas sugestões que os usuários criaram nesse tópico:
Eight beeps means a display failure.
Since the external monitor works, you know it's not a fault with the video card.
With the notebook off, hold down the "D" key and power the notebook on. If you get solid colors on the screen, then you know the LCD is good. I would look for a problem with the video cable. Just resently, someone found that the front bezel was creating a problem with the video cable.
Aqui está outro:
I encountered the same issue. The laptop had fallen from a table approximately 2-feet above the floor. Upon subsequently attempting to start the N5110 Dell laptop, I saw a white screen and heard 8 beeps. The screen did not change from all-white, and the beeps would resume approximately every 15-seconds.
My solution was to open the computer so that I could see the motherboard. Watch any of a number of videos on youtube for guidance if you are unfamiliar with the technique for properly disassembling and reassembling the N5110 chassis. I removed the CMOS battery from its case on the left-front of the motherboard, After a minute I placed the same battery back into the socket. Taking care to reconnect the three electrical ribbons that run from the motherboard to the keyboard, the battery was replaced and the start button was pushed.
A boot notice appeared on the screen that the computer had been improperly shut-down, and I had the option of restoring to a previous point, or starting Windows normally. I selected the normal start, and after a longer than usual boot, the laptop returned to full functioning.
I don't know if the ol' CMOS battery trick will work in all instances of the dreaded 8-beep error, but pulling the battery and replacing it causes the system to perform a power reset. I wish you similar success should you encounter this issue.
E, finalmente, uma tag da Comunidade da Dell inteira dedicada ao Tela branca do N5110 8 Beeps . Esta tag tem apenas uma postagem.
Se você se sentir à vontade para abrir seu laptop, o O Manual de Serviço da Dell deve fornecer informações suficientes sobre como você pode verificar o cabo do monitor.