Problems Problems PROBLEMS!

[CastinShadows]

Hello Everyone,
I need some help with latest issue.
Car, 1991 Dodge Sahdow ES 2.5l Turbo

From the top,
I got in it Fired it up noticed CEL was on, So i shut it down and began to read the new Code.
Originally i had 12 27 35 55, This time i had 12 27 35 41 55.
I kept loosing count and kept cycling the ignition at least a dozen times.
On the last cycle i turned it to the on position and something clicked under the dash and Cluster went out and will not start.
So this is what does get power
In the ACC position everything works and all of its components.
In the on position i get nothing, No fuel pump, No Instrument absolutely nothing.
Start position nothing as well no clicks no half cranks nothing.
What i know 100% is good.
Battery is good, Cables are good and All of my under dash fuses are good (besides dome light that's been like that)
It seems as if everything that works off computer is dead. Is there a fuse inline or anything that i should check before buying new computer?
I also unplugged battery all day and let sit then tried again and nothing. UGGGH thanks for any help.

[85boostbox]

Sounds like your battery cable need to come off and be cleaned and retightened. Try that and report back.

[bgbmxer]

I have had my car while I was working on it and then trying to start it eventually not let me turn it over anymore. Wouldn't do anything as far as turn over but everything else worked. Disconnected the battery and plugged back in a plug that I had forgotten and it fired back up.

[cordes]

I would check the fusible links and also ensure you're getting power to the SBEC.

[85boostbox]

According to td.com he fixed it. Ended up being a ignition switch.