My CPU's making noises after i changed its capacitors.

Welcome to Tom's Forum!  

Often it's combination of the PSU and capacitors the only solution is to replace one of the offending parts <or> you can 'try' if possible to slightly OC the CPU. If the capacitors aren't the same EXACT spec then return it to whomever did the repair and request their replacements; assuming the problems wasn't present beforehand.

Further, a bad PSU can cause the capacitor failures in the first place...catch-22.

Hey thanks for your reply, but after googling around I found out it just my fan making the noise, disconnected it and the noise is gone. thanks anyway man!.

Yep the CPU fan can do that too ... I based my comments on your comments of origin...

Good Luck and I'm glad you traced the correct source!