Hi Gillian17,
Welcome to Dell Community Forum.
Please click on the link below for steps for trouble-shooting No Power issues on Dell laptops.
If you are based in the USA, the link below has details for contacting Dell's Out of Warranty Repair Department if you need assistance with motherboard replacement, since your system is out of warranty.
Normally, in such cases, data which is saved on the hard drive is not affected (unless the hard drive has failed), RAM (Random Access Memory) is the memory available for the operating system, programs and processes to use when the computer is running and data is not saved on it.
If you have any further queries, please feel free to contact us.
Thanks and regards,
Babita S
#iworkforDell
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