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PC Won't Start When 4-Pin CPU Power is Plugged In

post #1 of 11
Thread Starter 
I was stress testing an overclock when my PC turned off completely. I'm running an AMD X4 640 (3.6GHZ at 1.5V) on a cheapy MSI 785GM-P45 board. After the PC turned off, the power LED started flashing until I disconnected the power.

Now when I try to turn it on, I can literally hear a very slight zap (almost inaudible) and nothing happens. The CPU fan turns a tiny bit, but then stops. I have disconnected everything and tested the PSU which turns on fine, but when the 4-Pin CPU Power cable is plugged in, the problem still exists. The system still powers on when I just plug in the ATX power connector.

Is my motherboard dead? Any chance that my other components are dead too?
post #2 of 11
I recommend trying to get the BIOS settings back to factory defaults somehow. Perhaps by just removing the CMOS battery and then discharging the capacitors by pressing the power button on your computer case a couple of times (as well as perhaps holding it down a bit too). I don't know. But if this works, then reduce that overclock. With a limitation to just a 4-pin connector, it just might not be enough power.
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(19 items)
 
  
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i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
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It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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post #3 of 11
Thread Starter 
Yeah, I already tried to reset the CMOS (first thing after a failed OC) and it didn't change anything. The problem doesn't seem to be that the CPU isn't receiving enough juice because even with EVERYTHING unplugged (except the 4-pin CPU power) it doesn't start up. Guess it seems that the only possible option is that the mobo is dead.
post #4 of 11
Quote:
Originally Posted by commandercup;11743831 
Yeah, I already tried to reset the CMOS (first thing after a failed OC) and it didn't change anything. The problem doesn't seem to be that the CPU isn't receiving enough juice because even with EVERYTHING unplugged (except the 4-pin CPU power) it doesn't start up. Guess it seems that the only possible option is that the mobo is dead.
What about when the only two power cables connected are the 4-pin and the 24-pin? Or is that what you said you did already in the OP?
It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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post #5 of 11
Thread Starter 
Quote:
Originally Posted by TwoCables;11743954 
What about when the only two power cables connected are the 4-pin and the 24-pin? Or is that what you said you did already in the OP?

When the 24-pin and 4-pin are connected it doesn't work. Just the 24-pin works fine (everything starts spinning).
post #6 of 11
Could be you chip. 1.5 is a lot for the Athlon II's unless on a good water cooling system.
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post #7 of 11
Thread Starter 
I've decided to just buy a motherboard at Microcenter tomorrow to see if that fixes the problem. I doubt it's the CPU since the system doesn't start up even without the CPU... guessing the motherboard just couldn't handle the voltage going to the CPU since I've seen multiple places say that 1.5V led to stable overclocks (3.8GHZ etc.)

If anyone else has had a similar problem and found some sort of a solution, please post!
post #8 of 11
Exact same thing happened to me - same CPU & mobo, voltages around 1.5v. Temps were fine, around 53C core / 63C tmpin0 (not sure which is correct) running prime 95, and then the machine shut down with a blinking power led, and wouldn't power up anymore.

I RMA'd and am hoping that new board will work and nothing else was fried.

Did you find a solution? I'm thinking maybe one of the passively cooled chips (NB/SB) got fried? Cuz I also pumped up the NB voltage a little - i'll try not touching that next time...
post #9 of 11
Did your PSU come with an 8pin CPU hook up that looked like two 4pins on the same line? I had a similar problem because the two 4pins are not the same thing. Had to change them around to find the right one and poof everything works the way it should.
     
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CPUGraphicsRAMHard Drive
Intel Core m3-6Y30 Intel HD515 8GB 1866DDR3L Micron M600 MTFDDAV256MBF M.2, 256 GB 
CoolingOSOSMonitor
Fanless Win10 Home x64 Kubuntu 16.04 (requires Linux kernel 4.5/4.6) 13.3 inch 16:9, 1920x1080 pixel, AU Optronics A... 
CPUMotherboardGraphicsRAM
AthlonIIX4 640 3.62GHz (250x14.5) 2.5GHz NB Asus M4A785TD-M EVO MSI GTX275 (Stock 666) 8GBs of GSkill 1600 
RAMHard DriveHard DriveHard Drive
4GBs of Adata 1333 Kingston HyperX 3k 120GB WD Caviar Black 500GB Hitachi Deskstar 1TB 
Optical DriveCoolingOSOS
LG 8X BDR (WHL08S20) Cooler Master Hyper 212+ Kubuntu x64 Windows 7 x64 
OSMonitorPowerCase
Bodhi Linux x64 Acer G215H (1920x1080) Seasonic 520 HAF912 
CPUMotherboardGraphicsRAM
N450 1.8GHz AC and 1.66GHz batt ASUS proprietary for 1001P GMA3150 (can play bluray now!?) 1GB DDR2 
Hard DriveOptical DriveOSOS
160GB LGLHDLBDRE32X Bodhi Linux Fedora LXDE 
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Kubuntu SLAX 1280x600 + Dell 15inch Excellent! 
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post #10 of 11
I would definitely not trust an overclock that high on a low end motherboard, especially MSI. a lot of MSI boards lately have failed and even blown up from the slightest overclock.
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Hard DriveOptical DriveOSMonitor
500GB Samsung Spinpoint F4 POS OEM Dell DVD burner Windows 7 Ultimate x64 Compaq S1922@ 1366x768 
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