How to find the good power supply ?

Hello,
I've just bought an AES system with no PSU.
After reading a lot of questions / answers in the forums, I saw that the correct PSU for my system is the 9V / 1,2 A.

In fact, at the back is written : NEO-GEO AEC ,8W, PRO POW E.
But, I also saw that sometimes the back inscription is not the same as the original motherboard.

After opening the console, the motherboard says : AES3-4
I Had try a Sega Megadrive PSU, but it's not Work (output from 10 V !)

If someone could help me ?
I have 3 games and I'm very upset to not play with !

Thanks
Mitch

A pro-pow 3 system will work with 9v, 10v, 12v and even much more just as well. The Megadrive PSU probably didn't work because the polarity of the plug wrong for the Neo (which requires negative tip and positive outside).

Thanks for your quickly response !
I Will try to invert the polarity.

Is the PRO PROW 3 and PRO PROW E have the same voltage ?

pro-pow3 and pro-powE are exactly the same (same voltage regulator inside).