120GB Toshiba in TX690

I have a Sony VGN-TX690P.

I am attempting to install a 120GB Hard Drive to replace the 60GB Toshiba.

I have a Toshiba MK1214GAH 120GB Hard Drive with a ZIF40 connector.

I purchased on Ebay an adapter which adapts a hard drive with Zif40
connector to a 50 pin Type T IDE connection. Toshiba does not produce
Hard Drives over about 80GB with a Type T 50 pin IDE interface, all of their
drives above 80GB have a ZIF40 interface.

I connected the 120GB to the TX690 via a USB 2.5" external housing, with
an Addonics 2.5" to 1.8" adapter card, then connected to the IDE/Zif40
adapter.

Windows XP found the drive, and I formatted it NTFS using XP Disk Management, Assigning letters H and K to the 40 and 80GB partitions.

On the 40gb partition I cloned my existing Xp system using Acronis.

The drive functions properly, Xp is place, Boot.ini is set so it should work.

The 120Gb was swapped, fit fine even with the adapter,

BUT--------

When I attempt to boot the TX it refuses to power up, start switch blinks
for half a second then shuts off. This sounds like a serious issue like a reversed connector or pin mismatch, however the drive runs fine as a USB external.

Makes me think there is a pinout issue, but after much tracing it appears
to be connected correctly. Is this one of those cases where Sony circuitry
is doing something weird, would'nt be the first time.

Anyway, any thoughts or suggestions are greatly appreciated.