No boot device found / Inspiron 5520 15R

Hi,

My 1 year and a half old 15R seems to have a bit of trouble when trying to boot. Actually, sometimes it just will turn on with no problem, but the other 9 times out of 10, I will just see a screen displaying the same text as a lot of other users "No boot device found".

When pressing F2, it shows that my hard drive is not detected. So, once I had a chance to run the diagnostics, I got the following message :

"ERROR CODE 2000-01 42

Validation 127487

Msg: Hard Drive 0 - S/N S2TBJC0C200821, Short self test unsuccessful"

So I guess my hard drive is good to throw away ? And my warranty expired in august by the way.

I hope someone will be able to help with all that info

Thanks !