Can you jumper PSU Green/Black to power on a PC?

Sasqui · Dec 16, 2016

Got a friends DELL pc that has intermittent power-on problems. Had to push the case power button numerous times (like a LOT) before the PC would turn on. It progressively got worse, now won't power on at all.

Question (ok two):

Can you jumper the green/black PSU-Motherboard wires to turn on the PC WHILE IT'S PLUGGED IN to the MB? I've never done that before, but powered up plenty of PSU's while they weren't plugged into a MB.

I found the header on the MB from the case switch, but don't know what pins are the power-on ones. The DELL service tag is 9TR3VK1 ...is there any way to get a pin diagram from DELL?

TIA!

natr0n · Dec 16, 2016

I would remove the psu and jumper it on its own to see if it works first.

Could be a faulty power switch on the case as well.
Could be motherboard has gone bad too.

Ebo · Dec 16, 2016

Cant you see which pins that the powerbutton is connected to on the MB ?.

Just put a jumper on them then.

natr0n · Dec 16, 2016

Ebo said:
Cant you see which pins that the powerbutton is connected to on the MB ?.

Just put a jumper on them then.

Thing is some Dells have proprietary connections usually.

Sasqui · Dec 16, 2016

Ebo said:
Cant you see which pins that the powerbutton is connected to on the MB ?.

Just put a jumper on them then.

I found the header clear as day, but don't know what pins to jump.

Ebo · Dec 16, 2016

Can you find the model no on Dells website and look for a manual ?

Sasqui · Dec 16, 2016

Ebo said:
Can you find the model no on Dells website and look for a manual ?

http://www.dell.com/support/home/us/en/04/product-support/servicetag/9TR3VK1/manuals

Manual here: http://downloads.dell.com/manuals/a...sktop/studio-desktop_service manual_en-us.pdf

Towards the end they show the FPANEL connector, but no details

natr0n · Dec 16, 2016

http://en.community.dell.com/cfs-fi...components-files/3514/0638.fp_5F00_header.jpg

Bill_Bright · Dec 16, 2016

Sasqui said:
I found the header clear as day, but don't know what pins to jump.

You short the two pins with the two wires that lead back to the case's front panel power button and yes, you can short the two pins while those wires are attached with no problems. That is exactly what pushing the button does (if working correctly).

If the PSU and computer starts up properly every time when you short those two pins, then your button switch is likely bad. Some times, the mechanism to hold the button properly in place becomes loose and you can just bend it in back tight. If plastic, then you cannot bend it back. If this case has a Reset button too, you can just swap the two wires from the reset button and put them where the power buttons went on the motherboard. Then use the Reset button for power from now on.

But understand your symptom (needing to press the power button a bunch of times) often indicates the power supply is failing, not a bad switch.

Sasqui · Dec 16, 2016

natr0n said:
http://en.community.dell.com/cfs-fi...components-files/3514/0638.fp_5F00_header.jpg

Worth a shot, looks like the same pins on this MB. I'll report back

Edit:

Bill_Bright said:
But understand your symptom (needing to press the power button a bunch of times) often indicates the power supply is failing, not a bad switch.

Yeah, that's what I'm afraid of.

Bill_Bright · Dec 16, 2016

I caution you about a couple things. There is NO mandatory industry standard for the pin-outs of motherboard front panel I/O headers. So while that image above came from Dell, do not assume it is correct for that THAT specific motherboard. Get in carefully with a bright light and read the labels and/or carefully follow the wires back to the switch.

Also, it is only in recent years the "suggested" color coding for wires became standardized. So, when dealing with power, it is best to go by pin number and actual labels rather than colors - this is especially true with older systems.

Sasqui · Dec 16, 2016

Motherboard must be toast, shorting the pins does nothing. I can power up the PSU either alone or connected to the MB. When connected to the MB, fans spin up, etc. but no video signal. I've always wondered about the relay circuitry between the power header on the MB and PSU... it's a mystery to me.

Frick · Dec 16, 2016

Or you can be a man and just short random pins until it powers on.

Sasqui · Dec 16, 2016

Bill_Bright said:
I caution you about a couple things. There is NO mandatory industry standard for the pin-outs of motherboard front panel I/O headers. So while that image above came from Dell, do not assume it is correct for that THAT specific motherboard. Get in carefully with a bright light and read the labels and/or carefully follow the wires back to the switch.

Carefully, lol. I shorted just about every pin I could with a screwdriver, no life whatsoever.

Frick said:
Or you can be a man and just short random pins until it powers on.

LOL, you beat me to it.

jboydgolfer · Dec 16, 2016

Sasqui said:
Carefully, lol. I shorted just about every pin I could with a screwdriver, no life whatsoever.

LOL, you beat me to it.

I had an issue similar to this on an old Dell OptiPlex I don't recall the model. What I ended up doing is pulling the CMOS jumper pin and then putting it back on while hitting the power button and it would start up every time. Worth a shot

Or you could short it with the pair of pliers while powering it on

Sasqui · Dec 16, 2016

jboydgolfer said:
I had an issue similar to this on an old Dell OptiPlex I don't recall the model. What I ended up doing is pulling the CMOS jumper pin and then putting it back on while hitting the power button and it would start up every time. Worth a shot

Or you could short it with the pair of pliers while powering it on

Totally worth a shot. The DELL manual does show the CMOS jumper location and a reset password jumper right next to it.

Can't mess with this till tomorrow afternoon. Date night tonight!

...then a snowstorm tomorrow :/

Caring1 · Dec 17, 2016

Bill_Bright said:
But understand your symptom (needing to press the power button a bunch of times) often indicates the power supply is failing, not a bad switch.

With Dell Motherboards it can also indicate a bad Motherboard, or Capacitor in particular.
I've had a couple with that issue and the power button glows Green when running correctly, and Orange when malfunctioning.

Bill_Bright · Dec 17, 2016

Caring1 said:
With Dell Motherboards it can also indicate a bad Motherboard, or Capacitor in particular.

Of course! But that is with any brand motherboard and not just a Dell. And as I noted, it "often" indicates a failing PSU.

System Name	Senile
Processor	I7-4790K@4.8 GHz 24/7
Motherboard	MSI Z97-G45 Gaming
Cooling	Be Quiet Pure Rock Air
Memory	16GB 4x4 G.Skill CAS9 2133 Sniper
Video Card(s)	GIGABYTE Vega 64
Storage	Samsung EVO 500GB / 8 Different WDs / QNAP TS-253 8GB NAS with 2x10Tb WD Blue
Display(s)	34" LG 34CB88-P 21:9 Curved UltraWide QHD (34401440) FREE_SYNC*
Case	Rosewill
Audio Device(s)	Onboard + HD HDMI
Power Supply	Corsair HX750
Mouse	Logitech G5
Keyboard	Corsair Strafe RGB & G610 Orion Red
Software	Win 10

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Video Card(s)	EVGA 3070ti FTW
Storage	Various
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Case	Thermaltake Level 20 VT \| Black bench
Audio Device(s)	LOXJIE D10 + Kinter Amp + 6 Bookshelf Speakers Sony+JVC+Sony
Power Supply	Super Flower Leadex III ARGB 80+ Gold 650W \| EVGA 700 Gold
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Benchmark Scores	http://valid.x86.fr/79kuh6

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Audio Device(s)	Asus Xonar SE pci-e card
Power Supply	Thermaltake DPS G 1050 watt Digital PSU
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Keyboard	Corsair K70
Software	windows 10 64 pro bit

System Name	natr0n-PC
Processor	Ryzen 5950x-5600x \| 9600k
Motherboard	B450 AORUS M \| Z390 UD
Cooling	EK AIO 360 - 6 fan action \| AIO
Memory	Patriot - Viper Steel DDR4 (B-Die)(4x8GB) \| Samsung DDR4 (4x8GB)
Video Card(s)	EVGA 3070ti FTW
Storage	Various
Display(s)	Pixio PX279 Prime
Case	Thermaltake Level 20 VT \| Black bench
Audio Device(s)	LOXJIE D10 + Kinter Amp + 6 Bookshelf Speakers Sony+JVC+Sony
Power Supply	Super Flower Leadex III ARGB 80+ Gold 650W \| EVGA 700 Gold
Software	XP/7/8.1/10
Benchmark Scores	http://valid.x86.fr/79kuh6

System Name	Senile
Processor	I7-4790K@4.8 GHz 24/7
Motherboard	MSI Z97-G45 Gaming
Cooling	Be Quiet Pure Rock Air
Memory	16GB 4x4 G.Skill CAS9 2133 Sniper
Video Card(s)	GIGABYTE Vega 64
Storage	Samsung EVO 500GB / 8 Different WDs / QNAP TS-253 8GB NAS with 2x10Tb WD Blue
Display(s)	34" LG 34CB88-P 21:9 Curved UltraWide QHD (34401440) FREE_SYNC*
Case	Rosewill
Audio Device(s)	Onboard + HD HDMI
Power Supply	Corsair HX750
Mouse	Logitech G5
Keyboard	Corsair Strafe RGB & G610 Orion Red
Software	Win 10

System Name	Brightworks Systems BWS-6 E-IV
Processor	Intel Core i5-6600 @ 3.9GHz
Motherboard	Gigabyte GA-Z170-HD3 Rev 1.0
Cooling	Quality Fractal Design Define R4 case, 2 x FD 140mm fans, CM Hyper 212 EVO HSF
Memory	32GB (4 x 8GB) DDR4 3000 Corsair Vengeance
Video Card(s)	EVGA GEForce GTX 1050Ti 4Gb GDDR5
Storage	Samsung 850 Pro 256GB SSD, Samsung 860 Evo 500GB SSD
Display(s)	Samsung S24E650BW LED x 2
Case	Fractal Design Define R4
Power Supply	EVGA Supernova 550W G2 Gold
Mouse	Logitech M190
Keyboard	Microsoft Wireless Comfort 5050
Software	W10 Pro 64-bit

System Name	Black MC in Tokyo
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Motherboard	MSI X670E Gaming Plus Wifi
Cooling	Be Quiet! Pure Rock 2
Memory	2 x 16GB Corsair Vengeance @ 6000Mhz
Video Card(s)	XFX 6950XT Speedster MERC 319
Storage	Kingston KC3000 1TB \| WD Black SN750 2TB \|WD Blue 1TB x 2 \| Toshiba P300 2TB \| Seagate Expansion 8TB
Display(s)	Samsung U32J590U 4K + BenQ GL2450HT 1080p
Case	Fractal Design Define R4
Audio Device(s)	Plantronics 5220, Nektar SE61 keyboard
Power Supply	Corsair RM850x v3
Mouse	Logitech G602
Keyboard	Dell SK3205
Software	Windows 10 Pro
Benchmark Scores	Rimworld 4K ready!

System Name	Americas cure is the death of Social Justice & Political Correctness
Processor	i7-11700K
Motherboard	Asrock Z590 Extreme wifi 6E
Cooling	Noctua NH-U12A
Memory	32GB Corsair RGB fancy boi 5000
Video Card(s)	RTX 3090 Reference
Storage	Samsung 970 Evo 1Tb + Samsung 970 Evo 500Gb
Display(s)	Dell - 27" LED QHD G-SYNC x2
Case	Fractal Design Meshify-C
Audio Device(s)	on board
Power Supply	Seasonic Focus+ Gold 1000 Watt
Mouse	Logitech G502 spectrum
Keyboard	AZIO MGK-1 RGB (Kaith Blue)
Software	Win 10 Professional 64 bit
Benchmark Scores	the MLGeesiest

System Name	H7 Flow 2024
Processor	AMD 5800X3D
Motherboard	Asus X570 Tough Gaming
Cooling	Custom liquid
Memory	32 GB DDR4
Video Card(s)	Intel ARC A750
Storage	Crucial P5 Plus 2TB.
Display(s)	AOC 24" Freesync 1m.s. 75Hz
Mouse	Lenovo
Keyboard	Eweadn Mechanical
Software	W11 Pro 64 bit

Can you jumper PSU Green/Black to power on a PC?

Fishfaced Nincompoop