Is my ECU dead?

Hi everyone, I'm new to the S-12 community but I've been working on cars for over 10 years so I'll get right to the point.  I recently bought an 87 200sx from my brother-in-law and besides a few older car quirks she ran fine.  Other than replacing the old battery I decided to not to mess with anything else.  She ran strong for about a month and then died on me while driving down the road at about 50mph.  There was no shuttering or anything but it was more like someone simply turned the key off.  I got it towed home and noticed that the fuel pump wasn't priming.  I had seen stuff like this before so I isolated the fuel pump relay circuit and I can jump the relay manually and get the pump to turn on.  Here's where it gets weird for me.  After some more research, I decided to pull the ECU and check the diagnostic lights only to discover that the lights wouldn't blink at all.  Is there anyway to check to make sure that the ECU is even receiving power?  Is there a separate relay or fused circuit that supplies power? 

P.S.  I checked a few other vital relays and noticed that the ECU is not grounding the (-) side of the coils to energize the relays so I'm thinking that the ECU is the common link here but I'm not sure how to proceed. 

Thanks for any advice.

Had the same exact thing happening to me and that was the ECU. In my case, kicking the ECU with my feet will bring the car back to live for an instant. I didn't really try to find out what was wrong with it and bought a jobber one. Was somewhat expensive even with the core.

Thanks for the advice Djay.  I was looking around and it seems like a replacement ECU is pretty expensive.  If at all possible I would at least like to find out which pin(s) is supplying power to the unit just to be sure.  Where did you yours at?

Do you need Ca20 Ecu or Vg30.

If Ca20 I can get you them for days. For super cheap.

I have the 4 cyl non turbo.  That's the CA20 right?

There is one at the yard right now. Might be able to snag it for you.

Check your fuses and fusible links first. A used $70 ECU won't fix a $2 fuse. Occam's razor says don't look for a complicated answer. The simplest answer is usually the correct one. Eliminate the easy cheap causes first.