2005 Western Star won't start

05 western star turns over great but won't start.
Has a series 60 Detroit
Battery terminals cleaned and good connections.
Used a test light and have power to all fuses in the fuse panel and battery box and their all good as well as power and grounds coming off fire wall all check out good.
Fuel pump is good
Only different thing I've noticed is the engine data on the data star won't display any info but exhaust temperature.
Any ideas?

 

Also noticed now that the check engine light doesn't come on when key is turned to on position.
Gave it a spray of ether and it runs off that.