Hi John,
One beep code indicates BIOS ROM checksum in progress or failure, BIOS Chip failure or motherboard failure. Please try releasing the residual charge. Here are the steps:
- Disconnect any external peripherals (flash drives, printers, external hard drives) from the rear and the front computer.
- Then remove all the cables including power cable, monitor, keyboard and mouse from the computer.
- Press and hold the power button on the computer for 10 seconds.
- Reconnect the power cable, keyboard, mouse and monitor cable only.
- Restart the computer and check if the computer is functioning properly.
If the issue still persist, you might consider replacing the motherboard. Please share the system's Service Tag and Owner's Name with me via private message (click my username and then click Start Conversation), if the system is in warranty. If not, you may contact our Spare Parts and Accessories dept on 1-800-357-3355 (Applicable for US Customers).
If you are in a different region, go to http://dell.to/18NmI2D select the country/region from the top, scroll down and click on 'Contact Dell Sales' to get the contact information.
Please reply if you have any questions.