• Welcome to TechPowerUp Forums, Guest! Please check out our forum guidelines for info related to our community.
  • The forums have been upgraded with support for dark mode. By default it will follow the setting on your system/browser. You may override it by scrolling to the end of the page and clicking the gears icon.

I NEED HELP PC DOESN'T BOOT

N

nicomala

New Member
Joined
Nov 13, 2022
Messages
12 (0.01/day)
I have a big problem.
Basically I bought an aio liquid heatsink (deecool castel 240mm egb v2) for the cpu and once the pc is mounted it doesn't start anymore.
The PC:
-deepcool qd750st
-Aorus B450 pro
-r7 5800x
-inno3d rtx3090ti x3 oc
-32gb 3000mhz
-x2 samsung m2 970evo 500gb
- x1 fan 120mm in case, x1 wifi usb adapter, x1 bluetooth usb adapter, x1 microsoft wireless controller usb adapter, x1 logitech k400 + usb adapter.

I know that a 750w with a 3090ti is not indicated, but before mounting the new aio the pc was fine, high frequencies, stability, all games max at 4k at 60/120 + fps, only 89/90 ° (peak ) on the cpu in maximum load. Could it be that the aio pump and fans (x1pump x2fans x3rgb) and the attached rgb connections consume so much that they exceed the total watts? When I turn on the power supply the LEDs on the main board are activated (sign of life) but when I turn on the PC it does not start and the psu "clicks"

Today I tried to mount a pq850m(850w), removed everything, reassembled, same thing, I turn on the psu and the LEDs on the motherboard do the check, on the other hand when the pc is turned on it gives no sign of life, not even a click of the psu
 
It sounds to me like the block may have been mounted too tightly, or the backplate may have been installed incorrectly. You wouldn't want bare metal touching the motherboard, even on the back.
 
You should short the CMOS jumper. These boards are smart enough to remember the last setting and sometimes even if you change the hardware it will still not work until you do that. With some Gigabyte boards the best thing to do is remove and reinstall the battery.
 
PSU cut out sounds like a short
 
If you did the Cmos thing, basically resetting the bios and that does not work:

Try to take it all down to the bare minimum, mobo with cpu and cooler, 1 ram stick, gpu and power supply. (and a monitor hooked up so you can see if windows is loading, this for all tests)

If that does not work, it does not turn on, then we have to take it back further, I would take the motherboard out of the case with the rest of the components and set it on a non conductive surface, table or so, and try to see if it can boot there.

Failing that I would remove the new cooler (carefully, you want ot avoid pulling the cpu out with it), take the cpu out, inspect its all good, re-seat it and reinstall the cooler (no reapplying paste), and make sure nothing there is shorting aka touching metal parts.

Heck you could see about starting it without putting the cooler on just yet, just to see if it wants to boot then.


If that still does not work then switch to that other psu to see if it does want ot start with that, sitll nothing then I would try to move the ram stick to a different slot or use a different stick, or a different gpu if you have something at hand.

really its just about eliminating possible factors, let us know how it goes.
 
PSU could not hold a full load PC, but 750W is fine just for a power up. Like Solaris said it sounds to me like a short
 
Last edited:
Guys, system won't start even without gpu, with 1 stick of ram and one fan
 
if its possible take a nice high resolution of the motherboard and show it to the community (front and back)
maybe the motherboard is damaged through over tightened
 
unplug all your rgb and everything - leave just the bare minimum plugged in and turn it on.

My bet it's one of the rgb doodads shorting.
 
hat said:
It sounds to me like the block may have been mounted too tightly, or the backplate may have been installed incorrectly. You wouldn't want bare metal touching the motherboard, even on the back.
Click to expand...
What can i did with bare metal at my mobo?
 
remove everything and mount it on top of a cardboard box
 
phanbuey said:
unplug all your rgb and everything - leave just the bare minimum plugged in and turn it on.

My bet it's one of the rgb doodads shorting.
Click to expand...
I have plugged all out, only 1 ram stick, cpu and m2 are installed
 
nicomala said:
I have plugged all out, only 1 ram stick, cpu and m2 are installed
Click to expand...

you don't need the m.2 and it's one less failure point.
move the ram stick around and then try the other and move it around to. Also check if there is any cpu pins missing.

It's one way to do it. But i guess with 2 psu's it isn't the psu. If you try the ram sticks it shouldn't be that either, 2 bad ram sticks simultaneous would be really bad luck. It "never" is the cpu. So that only leaves on thing, the mobo. Or some cable, also unlikely but you never know.

Assuming you did remove everything from the case.
 
Bomby569 said:
you don't need the m.2 and it's one less failure point.
move the ram stick around and then try the other and move it around to. Also check if there is any cpu pins missing.

It's one way to do it. But i guess with 2 psu's it isn't the psu. If you try the ram sticks it shouldn't be that either, 2 bad ram sticks simultaneous would be really bad luck. It "never" is the cpu. So that only leaves on thing, the mobo. Or some cable, also unlikely but you never know.

Assuming you did remove everything from the case.
Click to expand...
Windows is on the m2, i have to remove it?
 
nicomala said:
Windows is on the m2, i have to remove it?
Click to expand...

no, i'm just saying you don't need the ssd or even windows to see if it boots. You get a screen and can go to BIOS without it
try without it, remove it, just because it's another extra failure point you don't need
 
nicomala said:
What can i did with bare metal at my mobo?
Click to expand...
I took a good look at your cooler and the backplate doesn't seem to have any padding or anything, though the mounting areas have these plastic sleeves. So that shouldn't be an issue. That still leaves too high mounting pressure on the CPU, though. Maybe try loosening each screw a quarter turn and see what happens. Also, make sure something is plugged into the CPU fan header, whether it's the pump or a fan. Refer to your cooler manual to be sure, but I seem to remember the AIO I had calling for the pump to be plugged into the CPU fan header.
 
I am not sure about this specific MB, but many motherboards will not pass POST without the CPU fan header populated. @nicomala did you have the AIO pump cable plugged into the header labeled CPU_FAN by the top of the RAM slots? If so, try switching it to CPU_OPT and see if that works.
 
Count von Schwalbe said:
I am not sure about this specific MB, but many motherboards will not pass POST without the CPU fan header populated. @nicomala did you have the AIO pump cable plugged into the header labeled CPU_FAN by the top of the RAM slots? If so, try switching it to CPU_OPT and see if that works.
Click to expand...
Tried.. didnt works

The pc doesnt boot even with only:
Cpu + stock air cooler with 1 fan(in cpu_fan) + 24pin mobo cable + 8pin cpu cable + 1 ram stick + power cable
 
I request a picture of how the setup currently looks, heck perhaps a video that you can upload to youtube and link here for the procedure.
 
nicomala said:
Tried.. didnt works

The pc doesnt boot even with only:
Cpu + stock air cooler with 1 fan(in cpu_fan) + 24pin mobo cable + 8pin cpu cable + 1 ram stick + power cable
Click to expand...
Ok. So when you mounted a new AIO it died and will not boot even if you switch back to a small air cooler?

It sounds to me like either you pulled too much current through the fan headers or damaged the socket through too much pressure. Do you have any other motherboards?
 
Count von Schwalbe said:
Ok. So when you mounted a new AIO it died and will not boot even if you switch back to a small air cooler?

It sounds to me like either you pulled too much current through the fan headers or damaged the socket through too much pressure. Do you have any other motherboards?
Click to expand...
Yes it doesn't boot even with my previous stock air cooler.
Too much current through the fan headers, how?
No other mobos atm..
 
nicomala said:
Yes it doesn't boot even with my previous stock air cooler.
Too much current through the fan headers, how?
No other mobos atm..
Click to expand...
Some pumps can draw quite a bit more power than fans, and the headers may not be rated for it. It is unlikely but possible.

You don't have any other CPUs either?
 
Going back to what solaris said it seems a short is the most likely culprit to me, still going on (some screw stuck somewhere, under some heatshink for example), or that killed something, most likely the mobo.
 
You must log in or register to reply here.
Back
Top