[TenTec] Omni VI Help

[DAVID]

Hi everyone. I need some advice on an Omni VI I picked up at an estate sale. It's a nice looking rig, loaded with filters, but 
it will not power up. It is shorting the DC voltage to ground it appears. Took it to a friend's house and hooked it to an Astron 
30 amp supply and the voltage dropped to zero!! Darn!! 
So can anybody give me some advice as to what to look for or should I just bite the bullet and send it to Ten Tec?? 

Thanks in advance, Dave K9UX