Computer won't start. The only things that will start are my case and cpu fans.

[DrSandwich]

Ok, idk if this issue is in the correct thread, so let me know if I am.
Today I opened up my pc so I could fix my cpu fan (cpu was getting too hot) and insert this old ram I had. I turned the CPU fan around and then put the old ram in with my new ram for a total of 10gb. I turned it on, and only the fans started, even the LED on my case didn't turn on. I don't know what to do, any advice on how to fix?

Specs
i5 2400
Rx 470
Hyper X 8gb ram (the old ram was HP 2gb)

 

[OneFIshSunfish]

Does the computer start if you remove the old ram?
Also what do you mean turned the CPU fan around? what cooler are you using?

 

[DrSandwich]

Does the computer start if you remove the old ram?
Also what do you mean turned the CPU fan around? what cooler are you using?

No it does not start without the old ram or just that ram. All I meant was switch the cpu fan was move it from the bottom to the top because it would fall off occasionally.

I tried the system with 8gb stick ram (current) only, old ram only, and no ram, and it all did the same thing. Does this mean its not a ram issue?

Update: Plugged everything in, and USB ports still work (well, atleast one of them).

 

[Lucky Luck]

Does the computer start if you remove the old ram?
Also what do you mean turned the CPU fan around? what cooler are you using?

No it does not start without the old ram or just that ram. All I meant was switch the cpu fan was move it from the bottom to the top because it would fall off occasionally.

I tried the system with 8gb stick ram (current) only, old ram only, and no ram, and it all did the same thing. Does this mean its not a ram issue?

Update: Plugged everything in, and USB ports still work (well, atleast one of them).

it wont run without ram.
as i can understand, your pc turns on but you cant see anything on your screen(s).
check if all the cables connected properly and by that i mean the gpu's power cable (6 or 8 pin) and the cable from your pc to your screen(s)
i just noticed that this treath started on march the 13th adn that it is now april so is it working again or am i helping someone who's problem has already been fixed.