Ovation 920 Power-Up Woes

[Pseudo57]

I just bought a 920+ off of ebay and am trying to power it up. Whenever I insert a single power line (-5, +5, or +12) or the ground leads the power supply continues to work fine, but when I add a second line the power supply shuts down.

Why does it shut down like that? I try resetting the PS and it makes the panel click and then shuts off again.

What am I doing wrong?

 

[Pseudo57]

OK, I stayed up a few more hours and found out that I can get the projection panel to work using only the +5 and +12V lines. Whenever I add the -5V or any ground lines it shorts out.

Will this be detrimental to the lifetime of my panel?