Please list Dell model number and version of windows. Example: Dell Inspiron 3543, windows 10
In the meantime, eight beeps means there's an issue with the LCD screen. If you're comfortable in opening the computer, I'd suggest you reseat the LCD cable to see if that will make a difference. If that doesn't work, replace the LCD screen. Please enter your service tag number onto the link below to view your system manual.
If you aren't comfortable in opening computer, please enter your service tag number onto the link below to check your warranty status;
After, contact Dell Technical Support in the link below:
If you are out of warranty, click on link below: