Starting issue - Dead when key at ON and Start

[Portertg]

2003 LX 470
Situation is Car won't start. It doesn't turn over or anything. the Display doesn't have any lights on when the key is turned to ACC (typical I think - can't remember) or in ON.
things that work, Radio, power seats, mirrors, windows, sunroof, security light goes off when key is in, remote FOB works, done lights etc.
Cause and successful fixes.
I swapped the polarity when Jump starting it.
The Fusible link just off the (+) post of the battery was blown and has been replaced. The Batt Fuse in the engine comp (#18 30A) was blown and replaced. I did change out the Starter relay, but i think that wasn't necessary.
The OBD2 port does get battery voltage, but i don't know how to check it for signal from the ECU.
There is an aftermarket remote start on it. I do want to r3emove this.
I have checked all other fuses i know about, and all checked out with a multimeter.
Where can i look next before i take this to a mechanic?

 

[Portertg]

An update here. posting this so complete the investigation and results.

I did find a couple other fuses that were blown. fuse #22, AM2 15 A, and fuse #24, horn 10 A. I replaced both and then the vehicle starts and runs fine. I also replaced the battery.

As a secondary action, i did remove the aftermarket alarm / remote start.

I hope this might someone else in a similar situation.