Question Have a problem with my PC I just built

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ElectedMarmot42

ElectedMarmot42

Junior Member
Jun 15, 2023
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I recently build a PC and it just doesn't work. As far as I'm aware, all the correct cables are in their correct places. The lights on the motherboard are lit, which makes me believe it is receiving power. However, none of the fans are spinning, including those on the GPU and CPU Cooler. Can anyone help me figure out what's wrong? The build is linked except I'm using an S3 instead of an S5 Case. https://pcpartpicker.com/list/RQL3Kp. Here's a picture as well https://imgur.com/a/AYFJUlU
 
T

Tech Junky

Diamond Member
Jan 27, 2022
3,825
1,343
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It's hard to tell from the photo since it's in the case.

If the fans aren't spinning though it would indicate the system isn't actually powered on.

So, the PSU might be switched on but, the power button leads might not be connected correctly and powering on the system. Other things to look at are making sure the CPU is seated correctly / RAM is fully inserted.


Looking at the manual you can find the headers for the fans
1686846509075.png


So, in the upper Right corner seems to be the most important headers for fans being the CPU/opt

For the power switch on the case the bottom Right pins

Main power ATX appear to be connected but, with some PSU's you have cables that fit the smaller connections on the top Left but are pinned differently depending on the label on the cables. Sometimes using the aux cpu cable connector is the same as a PCIE cable but, the power pins are different.

Another thing might be outdated BIOS/UEFI as noted on PCP.
1686846797094.png

Now the flashback doesn't state if you need a CPU inserted or not and varies by vendor but, some work w/o a CPU inserted and then you just drop the CPU in and it works.
1686847053463.png
 
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BoomerD

BoomerD

No Lifer
Feb 26, 2006
65,655
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Make sure you have the two CPU cables (ATX12V 1 & 2, top left on the board) connected correctly.

None of the motherboard LEDs are lit? (Top right--BOOT, VGA, DRAM, CPU) Those will often give you a clue where to start.

Another thing to check is whether the board might be grounded to the case...perhaps a standoff in the wrong place?
 
ElectedMarmot42

ElectedMarmot42

Junior Member
Jun 15, 2023
7
1
11
Tech Junky said:
It's hard to tell from the photo since it's in the case.

If the fans aren't spinning though it would indicate the system isn't actually powered on.

So, the PSU might be switched on but, the power button leads might not be connected correctly and powering on the system. Other things to look at are making sure the CPU is seated correctly / RAM is fully inserted.


Looking at the manual you can find the headers for the fans
View attachment 81778


So, in the upper Right corner seems to be the most important headers for fans being the CPU/opt

For the power switch on the case the bottom Right pins

Main power ATX appear to be connected but, with some PSU's you have cables that fit the smaller connections on the top Left but are pinned differently depending on the label on the cables. Sometimes using the aux cpu cable connector is the same as a PCIE cable but, the power pins are different.

Another thing might be outdated BIOS/UEFI as noted on PCP.
View attachment 81779

Now the flashback doesn't state if you need a CPU inserted or not and varies by vendor but, some work w/o a CPU inserted and then you just drop the CPU in and it works.
View attachment 81781
Click to expand...
Previously, I disassembled the computer and rebuilt it, in hopes to fix any mistakes I may have made the first time. So I'm fairly confident the CPU is seated correctly and the RAM is fully inserted. I also tried updating the BIOS just now. I changed it to version 1212, the one recommended by PCP, nothing changed.
 
ElectedMarmot42

ElectedMarmot42

Junior Member
Jun 15, 2023
7
1
11
BoomerD said:
Make sure you have the two CPU cables (ATX12V 1 & 2, top left on the board) connected correctly.

None of the motherboard LEDs are lit? (Top right--BOOT, VGA, DRAM, CPU) Those will often give you a clue where to start.

Another thing to check is whether the board might be grounded to the case...perhaps a standoff in the wrong place?
Click to expand...
I believe both of the CPU cables are fully inserted and in the correct orientation. None of the diagnostic LEDs are lit, only the aesthetic lights. Finally, I disassembled and reassembled the whole thing, being much more vigilant for mistakes than the first time, so I'm pretty sure there are no standoffs loose in the case.
 
I

igor_kavinski

Lifer
Jul 27, 2020
24,268
16,925
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Is the power switch jumper connected to the case's power switch connector? You could try shorting the jumper pins, to rule out some problem in the case's power switch.
 
I

igor_kavinski

Lifer
Jul 27, 2020
24,268
16,925
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Take it out of the case. Put the plastic cover of the mobo on the box and place the mobo on that and try turning it on by shorting the power switch jumper pins of the mobo. If it still does not work, try a different PSU, if you have one lying around. Still does not boot? Maybe bad mobo. Are you sure that you installed the CPU correctly? There was no paste on the CPU underside pins? The CPU itself could be a dud too.
 
ElectedMarmot42

ElectedMarmot42

Junior Member
Jun 15, 2023
7
1
11
igor_kavinski said:
Take it out of the case. Put the plastic cover of the mobo on the box and place the mobo on that and try turning it on by shorting the power switch jumper pins of the mobo. If it still does not work, try a different PSU, if you have one lying around. Still does not boot? Maybe bad mobo. Are you sure that you installed the CPU correctly? There was no paste on the CPU underside pins? The CPU itself could be a dud too.
Click to expand...
Already tried shorting the power switch, I don't have another PSU, and the CPU only fits it one way.
 
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