Hello, That blinking code seems meaning either ram , motherboard or cpu failure. You tried with one single dimm , right ?  
Hello, My one year warranty ended in November 2020 ,the previous week my Precision 3431 SFF i9 stopped working  When i turn on nothnig happens  apart a 2,3 orange blinking. I have purchased a fourth RAM to test, without success. Do you have any ideas please ? Thanks Thanks.      
3431 Precision doesn't turn on