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2 Posts
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96
August 24th, 2024 16:38
I need help knowing what's the problem with my pc after trying a new PSU
Vostro 3910
I have a Dell Vostro 3910 desktop (not a full tower). I also have bought an ASUS RTX 3050 6GB.
I needed to upgrade the original PSU, which was almost 180W, so I bought a Lian Li PS850 and an SFX 850W PSU.
I tried installing it using a tutorial on YouTube (link). But after doing that the PC didn't do anything, it didn't even look like it had any power at all.
I put the old PSU back, and when pressing the power button, the CPU fan starts, then the PC shuts down, tries booting again and shuts down, then stays shut down.
I tried removing RAM sticks, I even tried them on another computer, it turns out one of them has gone bad, the other one is working fine (it is in the other PC as well).
I really don't know what might be the problem, can you guys help me out?
redxps630
9 Legend
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14.4K Posts
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August 24th, 2024 18:07
unfortunately that youtube video is for Inspiron 3880 which has a white 6 pin Dell proprietary socket on motherboard. It does not apply to 3910 which has a white 8 pin Dell proprietary socket that has a different pinout from the 6 pin in 3880. By using a 24 to 6 pin adapter for 3880 incorrectly in 3910, there is a risk of damaging motherboard and ram etc.
if still within warranty ask Dell repair to replace the 3910 motherboard.
(edited)
redxps630
9 Legend
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14.4K Posts
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August 24th, 2024 18:17
3880 6 pin
Dell 6 pin
new 8 pin for 3910
PWR_OK
Gray
12V
Lilac
12V
Lilac
Gnd
Black
Gnd
Black
PS_ON
Blue
(edited)
beekkh
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2 Posts
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August 26th, 2024 07:30
@redxps630 I used a 24-pin to 8-pin cable, but still went wrong.
I'll try dell repair to see if they can fix the problem.
Thank you
redxps630
9 Legend
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14.4K Posts
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August 26th, 2024 12:35
The 24 to 8 pin adapter you used is for older Dell model. It doesn’t work for new Dell 8 pin.
https://www.dell.com/community/en/conversations/inspiron-desktops/dell-proprietary-old-8-pin-and-new-8-pin-different-pinout/647fa251f4ccf8a8de7cb807?keyword=8%20pin