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Try just one memory module at a time and switch slots.
That is the biggest issue I have had with the X3 at least...
 
Do the beep codes change if you pull the ram and graphics card?
 
I think your best path forward is going to be carefully listening to and documenting the beep pattern, then lookup the codes on the site I linked earlier.

Good luck!
 
That’s not the worst outcome… you can flash a replacement at least…
 
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