I really hope... your Husband regularly backs-up his computer???
The computer may have crashed.
Or is on its way out.
Take out your Dell papers/paperwork.
Call them.
Tell them what is happening.
I hope, your Husband also has all his passwords etc., not only on the computer?
You may have to somehow get the computer to start in "safe mode."
This is when, the computer is 'dying' or cannot start in its regular mode.
Regardless, you need to call Dell.
Whether or not you have to pay.
Dell, is good per service.
It could be your mother board, your hard drive, your whole system, that is having problems.
It could be a variety of things.
But call, Dell.
They have to walk you through, questions/answers per your computer and what is happening.
that happened to my computer once.
My Computer was dying.
But I don't know if your Husband's case.
So, call Dell.
If you do not know what you are doing... you could make it worse.
Main thing, is, if you can, is to BACK up your computer.
Meaning... via an External, hard-drive.
But you wouldn't be able to do that if the computer can't even boot up.