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Can't turn off my system? Strange power issue

post #1 of 5
Thread Starter 
First time ever this happened today.
I turned off my system as normal. Left for about 10 minutes to go do something. Come back into my room to discover that the PSU fan is still on and the motherboard LED lights were still on.
The fans weren't spinning. Nothing was turned on except the PSU fan and the motherboard LEDs. Fan controller also was not powered on.

Now here's the strange part.
I switch off the PSU, turning the switch to the off position. The PSU fan was still spinning, and motherboard LEDs were still on...
I noticed that whenever I switch the PSU off a red LED lights up next to my CMOS battery.
The PSU fan and LEDs stayed on for a minute.
Unplugged the PSU, it was still on...

Then I unplugged my external hard drive's USB cable and bam, everything turns off. Plug it back in and the PSU fan turns on again, mobo lights turn on again as well.

I've had this external HDD for years, and this has never occured to me before.

Thoughts?
Edited by kiwiasian - 8/21/11 at 5:37pm
post #2 of 5
Quote:
Originally Posted by kiwiasian View Post
First time ever this happened today.
I turned off my system as normal. Left for about 10 minutes to go do something. Come back into my room to discover that the PSU fan is still on and the motherboard LED lights were still on.
The fans weren't spinning. Nothing was turned on except the PSU fan and the motherboard LEDs. Fan controller also was not powered on.

Now here's the strange part.
I switch off the PSU, turning the switch to the off position. The PSU fan was still spinning, and motherboard LEDs were still on...
I noticed that whenever I switch the PSU off a red LED lights up next to my CMOS battery.
The PSU fan and LEDs stayed on for a minute.
Unplugged the PSU, it was still on...

Then I unplugged my external hard drive's USB cable and bam, everything turns off. Plug it back in and the PSU fan turns on again, mobo lights turn on again as well.

I've had this external HDD for years, and this has never occured to me before.

Thoughts?
The PSU fan spinning for 1 min after the PC shutdown is normal to cool the components down before really down with just a standby power. But after unplug power cord from PSU and it is running for more than 1 min, there must be other power source connected to system. Don't think the external HDD had that kind of power source for the issue you described.

It could be just a sympton of aging PSU but for all the lights and fans still running after removing power cord, that is weird and beyond me.
ケンジ
(16 items)
 
  
CPUCPUMotherboardGraphics
i7-3960X i7-980X GA-X79-UD7 / GA-X58A-UD9 7970 + 465 
GraphicsRAMRAMHard Drive
2x 6990 + 580 16GB 2133 MHz 24GB 2000 MHz 120GB x 2 RAID0 
Hard DriveHard DriveCoolingCooling
120GB x 4 RAID0 Raptor 300GB x 2 RAID0 CPU-370 CPU-370 
CoolingCoolingOSPower
VID-AR699 EK FB X58A-UD9 Win 7 Ultimate x64 1500W / 1250W+1200W 
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ケンジ
(16 items)
 
  
CPUCPUMotherboardGraphics
i7-3960X i7-980X GA-X79-UD7 / GA-X58A-UD9 7970 + 465 
GraphicsRAMRAMHard Drive
2x 6990 + 580 16GB 2133 MHz 24GB 2000 MHz 120GB x 2 RAID0 
Hard DriveHard DriveCoolingCooling
120GB x 4 RAID0 Raptor 300GB x 2 RAID0 CPU-370 CPU-370 
CoolingCoolingOSPower
VID-AR699 EK FB X58A-UD9 Win 7 Ultimate x64 1500W / 1250W+1200W 
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post #3 of 5
Thread Starter 
Well it's never happened before, whenever I turn off my system everything goes out and the fan stops.

The external HDD is getting 5v power from a wall transformer. Maybe that is acting up.
post #4 of 5
Yea, current leakage from external 5 DCV is the power source. There is no other explanations other than that.
ケンジ
(16 items)
 
  
CPUCPUMotherboardGraphics
i7-3960X i7-980X GA-X79-UD7 / GA-X58A-UD9 7970 + 465 
GraphicsRAMRAMHard Drive
2x 6990 + 580 16GB 2133 MHz 24GB 2000 MHz 120GB x 2 RAID0 
Hard DriveHard DriveCoolingCooling
120GB x 4 RAID0 Raptor 300GB x 2 RAID0 CPU-370 CPU-370 
CoolingCoolingOSPower
VID-AR699 EK FB X58A-UD9 Win 7 Ultimate x64 1500W / 1250W+1200W 
  hide details  
Reply
ケンジ
(16 items)
 
  
CPUCPUMotherboardGraphics
i7-3960X i7-980X GA-X79-UD7 / GA-X58A-UD9 7970 + 465 
GraphicsRAMRAMHard Drive
2x 6990 + 580 16GB 2133 MHz 24GB 2000 MHz 120GB x 2 RAID0 
Hard DriveHard DriveCoolingCooling
120GB x 4 RAID0 Raptor 300GB x 2 RAID0 CPU-370 CPU-370 
CoolingCoolingOSPower
VID-AR699 EK FB X58A-UD9 Win 7 Ultimate x64 1500W / 1250W+1200W 
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Reply
post #5 of 5
Thread Starter 
Quote:
Originally Posted by Ken1649 View Post
Yea, current leakage from external 5 DCV is the power source. There is no other explanations other than that.
Yes I figured.
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