Question Rear USB ports aren't working ?

Feb 27, 2021
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Guys, Idk what happened but nowadays my rear USB ports aren't working which is really weird coz except for the USB ports all other ports like VGA, PS/2, mic, and speaker ports are totally working fine.

I took it to the pc repair shop they said the problem is with the motherboard USB ports are dead then I take it back to my house after a week it started to work again as my cousin unexpectedly inserted a pen-drive in one of the back USB ports. I was totally confused it worked for 3 days but after that again it stopped working, it's really weird lol.
My pc specs are :

Motherboard - B75MS
Cpu - I5 3470 (IGPU)
Memory - 4gb ddr3 ram
PSU - 450W Zeb