Question DIY computer doesn't work

[cihs]

Hello,
I changed my case and put everything back together in it to the new one.
When I turn on the PC, fans work and I hear a boot up sound.
There is no video output. My keybord's and mouse's lights doesn't light up.
GPU's fans also doesn't work.
I checked cables at power supply. They are all attached. (And I believe they connected to the correct places)
In my old case I had a place to put a DVD reader. I didn't attached it to the new one.
I don't think that is the issue though. (Should still boot up at BIOS and ask which drive to run, right?)
Any ideas?

PS: I also recently buy a CPU. It had a pin problem. Didn't get in the socket. Do you think I might have damaged the socket? My old CPU fit in perfectly.

 

[Lutfij]

I changed my case and put everything back together in it to the new one.
When posting a thread of troubleshooting nature, it's customary to include your full system's specs. Please list the specs to your build like so:
CPU:
CPU cooler:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
Monitor:
include the age of the PSU apart from it's make and model. BIOS version for your motherboard at this moment of time.

Please mention what you've changed as in their makes and models. If you have a short in your case, then no it won't even allow you to power up, let alone POST.

 

[Viking2121]

Got any pictures, and specs of the computer?

Also did you make sure the 4 or 8 pin in connected to the motherboard, normally up top of the board somewhere, Did you hook up the 6 or 8 pin to the GPU?

Do you have the display cable plugged into the GPU and not the motherboard?

 

[Lutfij]

PS: I also recently buy a CPU. It had a pin problem. Didn't get in the socket. Do you think I might have damaged the socket? My old CPU fit in perfectly.
That's not good.