Hi and welcome to JustAnswer.com. My name is XXXXX XXXXX I would love to assist you with your laptop issues.
Please boot your laptop and right away press F12 couple times.
do you see the hard drive on the boot up menu?
if you select that hard drive and press Enter
does it give you the same error message?
it starts serching for ethernet connection then gives the same message
That means the hard drive crashed.
You might want to remove the hard drive and put it back
Then try to boot it up again. See if it will read.
That means your drive needs to be replaced
Cannot mount the drive is the reason why.
You are welcomed
You can get a new hard drive and image it.Thanks and have a great day!