A SATA power supply riddle

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Recently got a new - new to me - computer. I wanted to add another hard drive. So I purchase a Lian Li hot swap tray. Now here is the problem.
I connected the sata data cables to the motherboard. I connected the power cable from the tray to a sata power cable - the other end of the power cable plugged to the power pack.
This cable worked fine on my old machine, but here nothing
So I swapped the plug into another power socket still nothing. (The other HDDs work fine)
Took another cable from the old machine same result notthing works.
I plugged the new disc power cable temporarily into a spare on the power cable going to the existing HDD and everyting works. WHY?
Went back to the other cables but again nothing
It defies logic. What is going wrong?
 
Last edited:
Dodgy tray connection?

If it's the same cable between the two machines, you should also remember that cables between different modular PSUs (even sometimes the same brand) may look identical, but be differently wired.
*Never* mix cables between PSUs.
Yes I see now the cables are wired differently.
Can simply cut the 3.3v cable?
 
Pictures
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Yes I see now the cables are wired differently.
Can simply cut the 3.3v cable?
the old PSU is a Corsair, the new one is Leadex. Yes the wiring is different
 
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