My system specs before upgrade :
CPU : Intel Pentium Dual Core E5400
Mobo : MSI G41M-P26
RAM : 4 GB DDR3 800 MHz
GPU : Asus Radeon HD 5450
PSU : 450W
I upgraded my cpu to Intel Core 2 Duo E7500
Now there's was no display. I knew this was RAM problem because it was happened before.
So I took out the 4 GB ram and put a 2 GB RAM on that slot. And the it worked fine. Everything worked fine on 2 GB RAM. The CPU was fine.
But when I put 4 GB ram instead of 2 GB, there's no display on the monitor, nothing happens. only the cpu fan is ON. The same ram worked with the previous cpu. So what could be the problem.
I've also reset the cmos by removing the battery but nothing.