Hi Mick,
This indicates motherboard failure on the computer.
Try to recover data from the hard drive.
I have provided a link below for drive savers data backup:
Click on the above link and select the options accordingly. They would help you in backing up data.
You can also contact any local technician to back up data.
If the computer has active warranty I shall go ahead and arrange for a service.
Check warranty status: http://dell.to/10pMa86
Kindly private message me the service tag of the computer. To private message the service tag click my User name and click Start conversation.
Awaiting your response!