Operating System not found (PXE-E61: Media test failure, check cable)

Hi all,

My laptop (Lenovo Ideapad Y570) running on Windows 7 64-bit stopped booting. These are the messages I receive while trying to boot:

Broadcom UNDI PXE-2.1 v12.2.5
Copyright Broadcom
Copyright Intel
All rights reserved.

Broadcom Base code PXE-2.1 v1.1.1
Copyright Broadcom
Copyright Intel
PXE-E61: Media test failure, check cable
PXE-M0F: Exiting Broadcom PXE ROM.
Operating System not found.

Diskpart lists this:

Volume ### Ltr Label Fs Type Size Status Info
------------ --- ---------- ---- --------- ------ ------- -----
Volume 0 E Repair Disc UDF DVD-ROM 165 Mb Healthy
Volume 1 C (No label) RAW Partition 59 GB Healthy
Volume 2 D Lenovo NTFS Partition 29 GB Healthy
Volume 3 F (No label) RAW Partition 654 GB Healthy Hidden
Volume 4 G Lenovo_Part NTFS Partition 14 GB Healthy Hidden

Things I tried so far:

1) bootrec /fixmbr works fine

bootrec /fixboot fails with the following message:

The volume doesn't contain a recognized file system.
Please make sure that all required file system drivers are loaded and the volume is not corrupted.

cd c:\ also gives the same error as above. I can only cd to x:\ drive.

bcdedit /export C:\BCD_Backup also doesn't work. Error: "The store export operation has failed. The volume doesn't contain a recognized file system."

bootrec /rebuildbcd & bootrec /rebuildbcd completes successfully but finds 0 Windows installations.

2) sfc /scannow completes fine with no errors. Didn't find any integrity violations.

3) Using Hiren's Boot CD, I was able to use DataRescue DD, created a RAW image of the hard drive and was able to able to copy some data out of it to a different hard disk.

4) Boot Repair Disk or Emergency BCD (EBCD) didn't work. EBCD couldn't backup and move old BCD files coz they were marked read only. Not sure how to take ownership of BCD files or to run EBCD as admin.

5) Ran Win 7 disk (X17-58997.iso) and selected "Startup Repair". It ran some repairs but reported it can't fix my computer automatically !

System Restore won't work coz it can't find any Windows Installation.

Interestingly I had the same issue 3 years ago and I had posted it here, but sadly I received no working solutions. That computer was brand new so I sent it back and Lenovo gave me a new one. This time I do have important data on my laptop.

So I am hoping I would get some idea how to fix it.