Question Display Issue on rx 550

Mar 24, 2019
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Hello,
So i bought gpu rx 550 like 6 months ago, the card works perfectly fine for few months but then suddenly it started showing no display, so i installed it on my brother pc, it gave display on his pc, so i tried other spare cards on my pc and they work perfectly fine but only rx 550 doesn't show display ( although fan spins when i boot). I tried taking out cmos, changing ram, checking psu and everything is OK i dont understand why it doesn't show display. (also it does not require 4 pin psu)

My specs:
Intel Core i7 2600
Dell inc. 0NW73C
2x4 gb DDR3 RAM
Vostro 470 (Casing)