6-mth old Sony Vaio (VGN-FS315s) laptop which has behaved impeccably, started to come up with "Operating System not found" error message on boot-up, last week.
On powering off and on again, and it managed to get as far as loading Windows, check disk would start but seconds later it would crash and reboot. On one try, ChkDsk ran successfully and recovered lost file clusters and Windows started successfully. A serious error report was sent to MS which came back with a "Hard Disk Drive Error Detected" analysis. I then ran ChkDsk on both partitions on the same HDD (fixing, marking bad sectors ticked), which were fine.
But it failed with "Operating System not found" on boot-up again.
Booting from an inserted recovery DVD initially did not "see" the DVD, even though the BIOS boot sequence is correct. But I did managed to recover from DVD. Installed other MS Office programs plus download critical updates (via WiFi connection) and it worked fine for a day or so.
However it has just repeated the "Operating System not found" on booting up.
Is it loose connections (as the inserted DVD was not seen on a couple of occasions?) or is it just a faulty HDD?