after testing (esc+fn)f2 there was 24 letter code: UBVUXL-5NB9M6-MFH15G-60RX03. what does it mean?
The code means "Hard Disk 1 Quick Test Failure"
You will need to replace the hard drive. If you can still boot into Windows you should backup all your personal files.
So, what you need is a 2.5" SATA3 HDD or for performance gain a 2.5" SATA3 SSD
On page 62 of the service manual, you can see the steps to replace the drive
You will need to reinstall the OS on the new drive
Hope it helps,
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