Vaio VGN-SR29VN HDD Flex Cable Part Number

Hello.
My flex cable for Vaio VGN-SR29VN has broke, and I ordered a new one.Now my laptop doesn't read HDD when I plug it on the motherboard via new flex cable.

I read some on google and find out that VGN-SR has two identical looking flex cables part number M750 & M751.

I bought M750. Now I don't know did I bought the right cable, and a few parts on my model have both M750 & M751 part number.

USB Board Connection Flex Cable M750
Dock Station Connection Flex Cable M750
DC...

Vaio VGN-SR29VN HDD Flex Cable Part Number