PC won't power up if the 4-pin CPU connector is connected

moh3en · Oct 15, 2018

Hello,

My mainboard won't power up if the 4-pin CPU connector is connected ! what problem? But when disconnect 4-pin CPU connector it's power up but no video!

I also check Power PSU in another PC and working fine

What probelm?

Mussels · Oct 15, 2018

it means you've missed something else as well

leave that 4 pin connected and check everything else, clear pictures of the system as well as filling out your system specs HERE would help

eidairaman1 · Oct 15, 2018

Make sure you are plugging in the right 4 pin connector

qubit · Oct 15, 2018

eidairaman1 said:
Make sure you are plugging in the right 4 pin connector

^^ That and there could also be a fault in the PSU or mobo. Also do the checks that Mussels said.

eidairaman1 · Oct 15, 2018

qubit said:
^^ That and there could also be a fault in the PSU or mobo. Also do the checks that Mussels said.

To tell you right now he said he tried it in a another system and it work correctly it's a possibility that in his machine that he is using the wrong plug and yes it is possible to plug in the wrong plug or the motherboard is toast or there is a short in the case somewhere, the video card is not seated correctly and he is not plugging in a power connector to the video card.

qubit · Oct 15, 2018

eidy, I actually had some faulty Antec garbage 10+ years ago that would work on one mobo, but not another. I'm talking about a minimum configured system for light load and testing, too. It just wouldn't post. It also failed the PSU tester, so unfortunately, checking them on another system is very likely to confirm good operation, but not a guarantee. Talk about muddying the waters, lol.

eidairaman1 · Oct 15, 2018

qubit said:
eidy, Iactually had some faulty Antec garbage 10+ years ago that would work on one mobo, but not another. I'm talking about a minimum configured system for light load and testing, too. It just wouldn't post. It also failed the PSU tester, so unfortunately, checking them on another system is very likely to confirm good operation, but not a guarantee. Talk about muddying the waters, lol.

That is true, I've had that before, some mobos are more tolerant than others too.

moh3en · Oct 15, 2018

Mussels said:
it means you've missed something else as well

leave that 4 pin connected and check everything else, clear pictures of the system as well as filling out your system specs HERE would help

I checked everything. Remove RAM Remove HDD Remove VGA ... and Just PSU and Mainboard and Cpu...

When connect PSU to 4pin connector don't power up

How i can check for Capacitors ?

eidairaman1 · Oct 15, 2018

moh3en said:
I checked everything. Remove RAM Remove HDD Remove VGA ... and Just PSU and Mainboard and Cpu...

When connect PSU to 4pin connector don't power up

How i can check for Capacitors ?

At this rate you will need to breadboard the system

qubit · Oct 15, 2018

You really want to connect another PSU at this point. If it fails, then mobo is toast. This result taken together with the PSU working in another system, is a pretty good indication that the mobo is at fault here.

But if it works, then, uh, grey area, lol. Just what you don't want.

HUSKIE · Oct 15, 2018

Blown VRM.. you need to trace with multimeter which vrm's are blown if you have knowledge on electronic or easy to replace the motherboard.

Vya Domus · Oct 15, 2018

Motherboard or PSU are toast.

HUSKIE · Oct 15, 2018

Vya Domus said:
Motherboard or PSU are toast.

op says tried the psu to other system and it worked

Vya Domus · Oct 15, 2018

Motherboard is toast then.

lexluthermiester · Oct 15, 2018

Vya Domus said:
Motherboard is toast then.

Very likely this or a bad CPU.

thebluebumblebee · Oct 16, 2018

What motherboard?

95Viper · Oct 16, 2018

Mussels said:
clear pictures of the system as well as filling out your system specs HERE would help

@moh3en ^THIS^
And, have you made any changes on the system recently, like, just before it began the problem?
Added any hardware/devices? Moved it? Cleaned it?
Is it on a new build or existing build?
It will be all guesses, until you answer a few questions by the members.

John Naylor · Oct 16, 2018

I have seen this before.... are you sure you are using the 4 pin EPS cable ?

moh3en · Oct 17, 2018

thebluebumblebee said:
What motherboard?

Asus H61M-K

95Viper said:
@moh3en ^THIS^
And, have you made any changes on the system recently, like, just before it began the problem?
Added any hardware/devices? Moved it? Cleaned it?
Is it on a new build or existing build?
It will be all guesses, until you answer a few questions by the members.

No change... Just when i want power up before bad power up.
I think it's for PSU and change it and for some day was good

But a day tried for power up PC don't Power up and ....

lexluthermiester said:
Very likely this or a bad CPU.

How sure it's for CPU ?

My Cpu now it's G2030 and Mainboard Asus H61M-K .... is possible if change with another CPU for test Make problem for another CPU ?

System Name	Rainbow Sparkles (Power efficient, <350W gaming load)
Processor	Ryzen R7 5800x3D (Undervolted, 4.45GHz all core)
Motherboard	Asus x570-F (BIOS Modded)
Cooling	Alphacool Apex UV - Alphacool Eisblock XPX Aurora + EK Quantum ARGB 3090 w/ active backplate
Memory	2x32GB DDR4 3600 Corsair Vengeance RGB @3866 C18-22-22-22-42 TRFC704 (1.4V Hynix MJR - SoC 1.15V)
Video Card(s)	Galax RTX 3090 SG 24GB: Underclocked to 1700Mhz 0.750v (375W down to 250W))
Storage	2TB WD SN850 NVME + 1TB Sasmsung 970 Pro NVME + 1TB Intel 6000P NVME USB 3.2
Display(s)	Phillips 32 32M1N5800A (4k144), LG 32" (4K60) \| Gigabyte G32QC (2k165) \| Phillips 328m6fjrmb (2K144)
Case	Fractal Design R6
Audio Device(s)	Logitech G560 \| Corsair Void pro RGB \|Blue Yeti mic
Power Supply	Fractal Ion+ 2 860W (Platinum) (This thing is God-tier. Silent and TINY)
Mouse	Logitech G Pro wireless + Steelseries Prisma XL
Keyboard	Razer Huntsman TE ( Sexy white keycaps)
VR HMD	Oculus Rift S + Quest 2
Software	Windows 11 pro x64 (Yes, it's genuinely a good OS) OpenRGB - ditch the branded bloatware!
Benchmark Scores	Nyooom.

System Name	PCGOD
Processor	AMD FX 8350@ 5.0GHz
Motherboard	Asus TUF 990FX Sabertooth R2 2901 Bios
Cooling	Scythe Ashura, 2×BitFenix 230mm Spectre Pro LED (Blue,Green), 2x BitFenix 140mm Spectre Pro LED
Memory	16 GB Gskill Ripjaws X 2133 (2400 OC, 10-10-12-20-20, 1T, 1.65V)
Video Card(s)	AMD Radeon 290 Sapphire Vapor-X
Storage	Samsung 840 Pro 256GB, WD Velociraptor 1TB
Display(s)	NEC Multisync LCD 1700V (Display Port Adapter)
Case	AeroCool Xpredator Evil Blue Edition
Audio Device(s)	Creative Labs Sound Blaster ZxR
Power Supply	Seasonic 1250 XM2 Series (XP3)
Mouse	Roccat Kone XTD
Keyboard	Roccat Ryos MK Pro
Software	Windows 7 Pro 64

System Name	Quantumville™
Processor	Intel Core i7-2700K @ 4GHz
Motherboard	Asus P8Z68-V PRO/GEN3
Cooling	Noctua NH-D14
Memory	16GB (2 x 8GB Corsair Vengeance Black DDR3 PC3-12800 C9 1600MHz)
Video Card(s)	MSI RTX 2080 SUPER Gaming X Trio
Storage	Samsung 850 Pro 256GB \| WD Black 4TB \| WD Blue 6TB
Display(s)	ASUS ROG Strix XG27UQR (4K, 144Hz, G-SYNC compatible) \| Asus MG28UQ (4K, 60Hz, FreeSync compatible)
Case	Cooler Master HAF 922
Audio Device(s)	Creative Sound Blaster X-Fi Fatal1ty PCIe
Power Supply	Corsair AX1600i
Mouse	Microsoft Intellimouse Pro - Black Shadow
Keyboard	Yes
Software	Windows 10 Pro 64-bit

System Name	PCGOD
Processor	AMD FX 8350@ 5.0GHz
Motherboard	Asus TUF 990FX Sabertooth R2 2901 Bios
Cooling	Scythe Ashura, 2×BitFenix 230mm Spectre Pro LED (Blue,Green), 2x BitFenix 140mm Spectre Pro LED
Memory	16 GB Gskill Ripjaws X 2133 (2400 OC, 10-10-12-20-20, 1T, 1.65V)
Video Card(s)	AMD Radeon 290 Sapphire Vapor-X
Storage	Samsung 840 Pro 256GB, WD Velociraptor 1TB
Display(s)	NEC Multisync LCD 1700V (Display Port Adapter)
Case	AeroCool Xpredator Evil Blue Edition
Audio Device(s)	Creative Labs Sound Blaster ZxR
Power Supply	Seasonic 1250 XM2 Series (XP3)
Mouse	Roccat Kone XTD
Keyboard	Roccat Ryos MK Pro
Software	Windows 7 Pro 64

System Name	Quantumville™
Processor	Intel Core i7-2700K @ 4GHz
Motherboard	Asus P8Z68-V PRO/GEN3
Cooling	Noctua NH-D14
Memory	16GB (2 x 8GB Corsair Vengeance Black DDR3 PC3-12800 C9 1600MHz)
Video Card(s)	MSI RTX 2080 SUPER Gaming X Trio
Storage	Samsung 850 Pro 256GB \| WD Black 4TB \| WD Blue 6TB
Display(s)	ASUS ROG Strix XG27UQR (4K, 144Hz, G-SYNC compatible) \| Asus MG28UQ (4K, 60Hz, FreeSync compatible)
Case	Cooler Master HAF 922
Audio Device(s)	Creative Sound Blaster X-Fi Fatal1ty PCIe
Power Supply	Corsair AX1600i
Mouse	Microsoft Intellimouse Pro - Black Shadow
Keyboard	Yes
Software	Windows 10 Pro 64-bit

PC won't power up if the 4-pin CPU connector is connected

moh3en

Mussels

Freshwater Moderator

eidairaman1

The Exiled Airman

qubit

Overclocked quantum bit

eidairaman1

The Exiled Airman

qubit

Overclocked quantum bit

eidairaman1

The Exiled Airman

moh3en

eidairaman1

The Exiled Airman

qubit

Overclocked quantum bit

HUSKIE

Vya Domus

HUSKIE

Vya Domus

lexluthermiester

thebluebumblebee

95Viper

Super Moderator

John Naylor

moh3en

System Name	Good enough
Processor	AMD Ryzen R9 7900 - Alphacool Eisblock XPX Aurora Edge
Motherboard	ASRock B650 Pro RS
Cooling	2x 360mm NexXxoS ST30 X-Flow, 1x 360mm NexXxoS ST30, 1x 240mm NexXxoS ST30
Memory	32GB - FURY Beast RGB 5600 Mhz
Video Card(s)	Sapphire RX 7900 XT - Alphacool Eisblock Aurora
Storage	1x Kingston KC3000 1TB 1x Kingston A2000 1TB, 1x Samsung 850 EVO 250GB , 1x Samsung 860 EVO 500GB
Display(s)	LG UltraGear 32GN650-B + 4K Samsung TV
Case	Phanteks NV7
Power Supply	GPS-750C

System Name	Main/DC
Processor	i7-3770K/i7-2600K
Motherboard	MSI Z77A-GD55/GA-P67A-UD4-B3
Cooling	Phanteks PH-TC14CS/H80
Memory	Crucial Ballistix Sport 16GB (2 x 8GB) LP /4GB Kingston DDR3 1600
Video Card(s)	Asus GTX 660 Ti/MSI HD7770
Storage	Crucial MX100 256GB/120GB Samsung 830 & Seagate 2TB(died)
Display(s)	Asus 24' LED/Samsung SyncMaster B1940
Case	P100/Antec P280 It's huge!
Audio Device(s)	on board
Power Supply	SeaSonic SS-660XP2/Seasonic SS-760XP2
Software	Win 7 Home Premiun 64 Bit