psu making noise and power supply tester's -5v LED is off

pk1991

Reputable
May 11, 2015
3
0
4,510
corsair VS450 making noises. I think its from fan and I tested it with power supply tester and it shows that PSU not supplying -5v. i.e tester's -5v LED is off.

Is -5v necessary for stable PC ?
and how to stop PSU noises?
please help

pics -
http://i.imgur.com/r7rsmCT.jpg
http://i.imgur.com/u4vZx2F.jpg

u4vZx2F.jpg

r7rsmCT.jpg