Hi! Swapped my old psu today. And now the computer wont turn on.

[Koaunut]

So i recentøy swapped out an old psu from my pc. (New psu Corsair CV 550) in order to upgrade my graphics card later on. However i wanted to test wether or not the pc would turn on befrir installing a new graphics card, and now it wont turn on. I tried wiring it efficiently so the cables didnt look like a mess. When that didnt work i pulled everything back to the center and connected the cables once again. Still didnt work. 

Here is a picture if the case in its current state:

 

[erico]

From what I see in the image you provided and comparing it to the Tampa2 mobo image below, the motherboard should power on.  https://support.hp.com/us-en/document/c06069168

I highlighted the required PSU connections in the image above for the motherboard to power on.

Reseat the 24-pin connector, the 6+2-pin cpu PWR connectors and the Front panel header connector and try again.  

If that did not work, I would remove the Corsair PSU and put the original PSU back in to verify that the mobo setup still works. If it does, there is a likely issue with the Corsair PSU. 

Honestly, you should have gone with the modular variety. It costs a bit more, but the hassle of cable organization otherwise, make it money well spent.