Ikelite D700 strobe(s) fire once

Hi,

my setup give me headache!

One Ikelite D700.

Two DS 51

One cord for one strobe.

One cord for two strobe.

(It use to work before.)

Ikelite module set to DS51.

The hot shoe is fully seated.

The lightning symbol show into the D700 screen indicator.

The AA battery are ok.

One strobe with the appropriate cord in TTL : Fire once and then nothing.

The other strobe with the appropriate cord in TTL : Fire once and then nothing.

Two strobes with the appropriate cord both on TLL : Fire once and then nothing.

I've switch off the camera : nothing

I've switch the strobes : Fire once and then nothing.

What's wrong?

Finaly find the reason.

Some springs became rusty in the ikelite hotshoe. After cleaning everything working.

Hope this help.