Welcome to the Community. 7 Beeps means its a processor failure. Contact Dell Technical support in your region for a replacement.
Did you change the Processor?
The Manual Says Processor Failure.
Report Unresolved Customer Service Issues here I do not work for Dell. I too am a user. The forum is primarily user to user, with Dell employees moderating.
Try reseating the memory. Dell is know for loose memory
Thank you for your speedy responses - I will replace the processor
hi David did you get your laptop repaired? if so how did you replace the CPU as i have the same problem