yossibm,
Some things to check:
- Make sure that you have the eSATA port fully enabled in the BIOS.
- Since you are using the port for a resident hard drive, you might want to disable the hot plug capability.
- Make sure you provide power to the drive. The eSATA cable does not provide power; it has to be provided separately. You had to provide power to operate the drive off the internal SATA connector; are you leaving this power connected when you switch to the external connector?
- Verify that the external connector works with an external enclosure. This may be the only way to verify the operation of the external connector and isolate the problem (to the cable).
...Scott