System not booting up

Jphilip2

Reputable
Dec 28, 2014
1
0
4,510
I upgraded my pc with i3 4150 processor,b-85m-k motherbord and 4gb ddr3 ram

But after installation system is not booting up.i can see light on motherboard but processor fan is not running.

I am having thermal master 420w PSU.

What will be the issue.?
 

sparky8251

Reputable
Mar 23, 2014
53
0
4,660
Since it's a recent upgrade I'm going to ask if you've made sure everything has been reconnected properly including fan power and power supply cables and even the case buttons. When I replace my motherboard or PSU I almost always forget to reconnect something.