I recently change my cpu from i3 3240 to I5 2500. (Yeah I know 3rd gen to 2nd gen downgrade but I needed the 2 extra cores)
But my real problem is when I put the i5 cpu then boot. The monitor says no signal but all the fans, gpu and even my mouse is lightning up. But it just a black screen. Then I put again my old i3 for retest and it boots up and I try to test a game with no prob. We test the cpu before I buy it (2nd hand). Is there anyway I can make it to work?
Ps. I already reset the bios. And it is already updated. And support the cpu based on their website. And also I tried to set ng ram to 1333 mhz from 1600 because I checked intel website i5 2500 only supports 1333 ram but nothing changed. I'm confused right now I don't know what to do. I only upgraded to slightly improve my game performance. (I used gtx 1050ti). I will try any suggestions
And another thing... Sorry for the bad english. Just try to understand it.
Edit: I have 500w psu (not the generic ones) and I also unplug and plug back the GPU and switch out my 2 rams
Edit: My motherboard is Biostar h61mhv v7
EDIT: I have made it to work!! But I've got a problem. I remove the GPU (GTX 1050ti) and it boots. I swear when I'm plugging in my i3 + gtx 1050ti it boots all the time but if I use the i5 2500 I'm stuck at black screen. Any help?
But my real problem is when I put the i5 cpu then boot. The monitor says no signal but all the fans, gpu and even my mouse is lightning up. But it just a black screen. Then I put again my old i3 for retest and it boots up and I try to test a game with no prob. We test the cpu before I buy it (2nd hand). Is there anyway I can make it to work?
Ps. I already reset the bios. And it is already updated. And support the cpu based on their website. And also I tried to set ng ram to 1333 mhz from 1600 because I checked intel website i5 2500 only supports 1333 ram but nothing changed. I'm confused right now I don't know what to do. I only upgraded to slightly improve my game performance. (I used gtx 1050ti). I will try any suggestions

And another thing... Sorry for the bad english. Just try to understand it.
Edit: I have 500w psu (not the generic ones) and I also unplug and plug back the GPU and switch out my 2 rams
Edit: My motherboard is Biostar h61mhv v7
EDIT: I have made it to work!! But I've got a problem. I remove the GPU (GTX 1050ti) and it boots. I swear when I'm plugging in my i3 + gtx 1050ti it boots all the time but if I use the i5 2500 I'm stuck at black screen. Any help?