Mac Pro 5.1 (flashed) doesn‘t boot


hello. have mac pro 4.1 (with flash on 5.1), 64 gb of ram , dual cpu board. graphics sapphire radeon hd7950 mac edition.
hard drives include 500gb samsung evo 840 high sierra, 500gb samsung evo 750 storage, 500gb samsung evo 850 windows 10 bootcamp, , 1tb hdd itunes , photo library.

problem: had cmos battery changed today, since not boot anymore.

mac hangs in different places in boot screen loading bar.

pram reset nothing brought.
cable off, wait 15 seconds, plug in , after 5 seconds turn on nothing brought.
single-user not going boot.
secured boats not work.
verbose mode not boot.

hard drives out, pcie-usb-3 card out, empty hdd in , try boot usb-stick not.

actually, nothing works anymore. changed battery back, nothing works anymore, stays in boot-screen loading bar.

help!!!

knows advice?
 

did install graphics card correctly after installing cmos battery? no bent pins?
 


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