Interesting problem with ATX 12v 4Pin

delusns · 04-14-2008, 05:15 AM

Hello,

I finished building my system, installed windows, etc and everything was running fine. Suddenly the power shuts off. When I tried to turn it back on, the power, fans etc would all turn on for a 1 sec and turn back off. Then it finally stayed off. Long story short, I ended up buying a new PSU and Mobo. Same thing happens. I isolated the problem to the ATX 12V 4 pin connector. When it's plugged in, the mobo won't turn on but when I unplug it, the mobo will turn on. Does this mean my CPU is fried? Any help would be appreciated. Thanks.

P.S. This problem occurs on both identical mobos. Troubleshooting with just the 24 pin and 4 pin connected outside case.

Specs:
Mobo: ECS GF7100PVT-M3
PSU: Thermaltake Purepower 500 ATX 12v 2.0
CPU: Pentium D 3 Ghz
Ram: 2GB

oscaryu1 · 04-14-2008, 01:35 PM

If it runs fine with the 12V unplugged, then leave it be.

StrangleHold · 04-14-2008, 01:55 PM

Quote:

Originally Posted by delusns

Hello,

I finished building my system, installed windows, etc and everything was running fine. Suddenly the power shuts off. When I tried to turn it back on, the power, fans etc would all turn on for a 1 sec and turn back off. Then it finally stayed off. Long story short, I ended up buying a new PSU and Mobo. Same thing happens. I isolated the problem to the ATX 12V 4 pin connector. When it's plugged in, the mobo won't turn on but when I unplug it, the mobo will turn on. Does this mean my CPU is fried? Any help would be appreciated. Thanks.

P.S. This problem occurs on both identical mobos. Troubleshooting with just the 24 pin and 4 pin connected outside case.

If its doing the same thing with a new P/S and board, have you got a case speaker hooked up to get the Bios beep tones?

delusns · 04-14-2008, 03:10 PM

Quote:

Originally Posted by oscaryu1

If it runs fine with the 12V unplugged, then leave it be.

The 12v is supposed to be in for the CPU power. Without it, the mobo turns on but won't do anything else.

delusns · 04-14-2008, 03:12 PM

Quote:

Originally Posted by StrangleHold

If its doing the same thing with a new P/S and board, have you got a case speaker hooked up to get the Bios beep tones?

Yup. But with the 12v plugged in, the mobo won't turn on, no beep, no fan or anything.

StrangleHold · 04-14-2008, 03:21 PM

What tone are you getting without the 4pin 12V CPU power pluged in. Usually a CPU or Memory tone is a repeative drive you crazy tone. Starting to sound like your CPU or Memory went out, plus since you have already replaced the board and P/S and the problem stayed the same.

delusns · 04-14-2008, 03:45 PM

Thanks Strangehold.

To be honest, I tried so many different scenarios with wire connections and wasn't listening to tones with the speaker wire in. I'll be sure to listen for it later. If it does do the crazy beeps/tones, that means its the CPU you think? The ram should still be good but I'll test that out too. Much thanks.

oscaryu1 · 04-15-2008, 02:33 AM

It could mean many things. Look up your BIOS Beep code.

delusns · 04-15-2008, 04:58 AM

Ok so I cleared CMOS. Connected ONLY the 24 pin to mobo with speaker and power fpanel wires attached. 12V NOT attached. Still same thing. CPU and PSU fans turn on but no sound or anything. @!#$%

Gonna try a new CPU tomorrow.

ChrisW92410 · 04-15-2008, 05:12 AM

had it happen to me JUST before i did a new or my most current build...but mine was a bad mobo, shit was a 2yr old asus and had my cousin (computer programmer) look at it he said samething i was thinking...bad mobo...might not be your case but probably not out of the question

04-14-2008, 05:15 AM	#1 (permalink)
delusns New Member Join Date: Apr 2008 Posts: 6	Interesting problem with ATX 12v 4Pin Hello, I finished building my system, installed windows, etc and everything was running fine. Suddenly the power shuts off. When I tried to turn it back on, the power, fans etc would all turn on for a 1 sec and turn back off. Then it finally stayed off. Long story short, I ended up buying a new PSU and Mobo. Same thing happens. I isolated the problem to the ATX 12V 4 pin connector. When it's plugged in, the mobo won't turn on but when I unplug it, the mobo will turn on. Does this mean my CPU is fried? Any help would be appreciated. Thanks. P.S. This problem occurs on both identical mobos. Troubleshooting with just the 24 pin and 4 pin connected outside case. Specs: Mobo: ECS GF7100PVT-M3 PSU: Thermaltake Purepower 500 ATX 12v 2.0 CPU: Pentium D 3 Ghz Ram: 2GB

04-14-2008, 01:35 PM	#2 (permalink)
oscaryu1 VIP Member Join Date: Apr 2007 Location: Houston, Texas Age: 13 Posts: 9,858	If it runs fine with the 12V unplugged, then leave it be. __________________ Core 2 Duo E2140 1.6GHz @ 3.04GHz GA-P31-DS3L pqi Turbo CL4 DDR2-800 2GB Sapphire HD3850 256MB Sony Writemaster DVD Burner EIDE Seagate Barracuda 80GB 7200.9 8MB SATII

04-14-2008, 03:21 PM	#6 (permalink)
StrangleHold Diamond Member Join Date: Nov 2005 Location: In a realm of unknown Wonders Posts: 6,840	What tone are you getting without the 4pin 12V CPU power pluged in. Usually a CPU or Memory tone is a repeative drive you crazy tone. Starting to sound like your CPU or Memory went out, plus since you have already replaced the board and P/S and the problem stayed the same. __________________ NZXT Apollo Athlon 64 X2 5600+ Gigabyte GA MA770 DS3 G Skill DDR2 800 2gb PNY 8800GT Spinpoint F1 500gb. Too bad stupidity isn't painful.

04-15-2008, 02:33 AM	#8 (permalink)
oscaryu1 VIP Member Join Date: Apr 2007 Location: Houston, Texas Age: 13 Posts: 9,858	It could mean many things. Look up your BIOS Beep code. __________________ Core 2 Duo E2140 1.6GHz @ 3.04GHz GA-P31-DS3L pqi Turbo CL4 DDR2-800 2GB Sapphire HD3850 256MB Sony Writemaster DVD Burner EIDE Seagate Barracuda 80GB 7200.9 8MB SATII

04-15-2008, 04:58 AM	#9 (permalink)
delusns New Member Join Date: Apr 2008 Posts: 6	Nope Ok so I cleared CMOS. Connected ONLY the 24 pin to mobo with speaker and power fpanel wires attached. 12V NOT attached. Still same thing. CPU and PSU fans turn on but no sound or anything. @!#$% Gonna try a new CPU tomorrow.

04-14-2008, 03:45 PM	#7 (permalink)
delusns New Member Join Date: Apr 2008 Posts: 6	Thanks Strangehold. To be honest, I tried so many different scenarios with wire connections and wasn't listening to tones with the speaker wire in. I'll be sure to listen for it later. If it does do the crazy beeps/tones, that means its the CPU you think? The ram should still be good but I'll test that out too. Much thanks.

04-15-2008, 05:12 AM	#10 (permalink)
ChrisW92410 Bronze Member Join Date: Apr 2008 Location: Rome, NY Age: 22 Posts: 59	had it happen to me JUST before i did a new or my most current build...but mine was a bad mobo, shit was a 2yr old asus and had my cousin (computer programmer) look at it he said samething i was thinking...bad mobo...might not be your case but probably not out of the question __________________ MOBO: MSI K9VM-V CPU: AMD ATHLON X2 5600+ RAM: 4GB CORSAIR XMS HDD: MAXATOR 300GB VIDEO: XFX GEFORCE 8600GT PSU: ROSEWILL RX850W SOUND: LOGITECH 5.1 SURROUND SOUND VIEW: 19IN ESA MONITOR CASE: ROSEWILL TU-155

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