Question PC turns on but no display output ?

[mralexoll]

Hey so I have replaced my Arctic Freezer 2 AIO via rma for a new one . Did it and installed it but now my PC does turn on. The pump works as I can see and hear it pumping water and the PC fans spin but my display lights up for a sec then turns off and when I manually turn it on it can not find a signal source. When I press the "Change Source" button. ( I use DisplayPort ) it switches to different ones but can not find anything and then a message pops up that I should check the cable or the output device .

BUT when I plug my monitor into my old pc it works . So I have:

• Reset the bios by removing the battery.
• Pulled out the ram and inserted 1 stick instead of 4 - nothing .
• Taken out the 3060 Ti and connected the monitor to the mobo - nothing .
• Installed my 1070 in th PC - nothing .
• Unplugged the aio and booted it and still the same turns on but no display output .
• Tried it out with 2 different monitors and the same happens all the time .

Any idea which component can be causing this and how to fix it ?
No idea if this is important or not but my PC was unplugged from power for a week while waiting for the new AIO .

My components
i9-10900
3060 ti gigabyte
3600 ram 4x kingston fury
750 watt psu
2X ssd 2x hdd
Asus z 590 mobo
2x samsung monitors
Arctic liquid freezer 2

 

[Fix_that_Glitch]

Make sure you have not overtightened the cooling plate to the cpu. This can cause this behavior. The only other thing I could advise is to remove the cmos battery and then try to start the pc.

 

[SorryBella]

Make sure you have not overtightened the cooling plate to the cpu.

If i may add: Its handtight with 1/4 turn extra at maximum for most chips.