Question Very strange problem when booting PC after changing the case ?

[Thormier]

Hello there ans thank you for your time for reading this, I recently just bought a new case and yet again after my 5th build something weird has happened.

So I got everything in the case and when trying to power it on, it powers on for a second then switches things off, so i thought fair enough i might have to change the PSU or MB or whatever, but then I noticed if I hold the LED button it stays powered on for about 5 mins, is this a cable problem?

My specs are:
Mobo: Gigabyte Z5390
GPU: 3060 Ti
CPU: Intel 11700k
RAM: some old DDR4 RAM which has always worked fine,

The things I'v tried so far are just the usual CMOS reset and switching RAM slots.
Does anyone know what could be going on here could you give me advice ?


Thanks for reading =]

 

[JohnBonhamsGhost]

when trying to power it on, it powers on for a second then switches things off

does the system power on/off correctly when shorting the power pins on the motherboard?
if so, then it is the case itself or the way you connected the cables from the front I/O.

include your complete specs with make & model of all components;
RAM, PSU, case, etc...