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What happens if you do this with a PSU?

post #1 of 7
Thread Starter 

If your system is off but your PSU's built-in switch is in the 'on' position, then what would happen if you unplug SATA power cables and even the EPS12V?

 

Someone I know here on OCN may have done this (the cables were unplugged in order to make room for some cleaning).  When they plugged the cables back in, their system wouldn't turn on and it hasn't turned on since .  Here's their thread:

 

http://www.overclock.net/t/1327695/system-wont-post

 

I am stumped.

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post #2 of 7
I've done that numerous times in the past. Only the 5VSB rail is on when the PC is off and it's not connected to those connectors so I'd assume it's fine.
You can even unplug SATA cables when the PC is on because sata drives can be swapped without powering down.
My guess is something was damaged during cleaning, disconnecting those cables shouldn't have done anything.
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post #3 of 7
Thread Starter 

But he said he may have unplugged those, including the EPS12V, while the PSU itself was on.  If the PSU's switch is in the 'on' position, is it potentially harmful to unplug the EPS12V?

 

I've never done it, so I couldn't answer from experience.

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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) 
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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 #4 of 7
The eps12v shouldn't have done anything because it only has 12v and ground wires. I've unplugged and plugged back in Sata drives with the system running so I don't really see that as being the problem either. Of course it could also just be luck of the draw (and he became the unlucky one)

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post #5 of 7
I've taken out one of the Sata cord from my hard drive, and plugged it into another with the PSU switch On.

Seems to be going fine... but now I'm worried...
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post #6 of 7
Thread Starter 
Quote:
Originally Posted by snipekill2445 View Post

I've taken out one of the Sata cord from my hard drive, and plugged it into another with the PSU switch On.

Seems to be going fine... but now I'm worried...

 

Well, he unplugged the EPS12V too (the 4 or 8-pin power connector on the motherboard).  He found that his motherboard and CPU died because he had a friend try his identical CPU in his motherboard, but it wouldn't work.  Then he tried his CPU in his friend's motherboard, but it didn't work.  His video card worked in his friend's system, so now he's looking at an RMA for both the motherboard and CPU.

 

So, it sounds to me like maybe the PSU's built-in switch was on and perhaps something happened when either unplugging the EPS12V, or when he plugged it back in.  I wouldn't know because I've never unplugged PSU cables with my PSU turned on (the same goes for plugging cables in).

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CPUMotherboardGraphicsRAM
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250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
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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 #7 of 7
EPS12V does nothing when the system is off. Only +5VSB has voltage when the PSU is in standby mode, and that only connects through the ATX connector. EPS12V only has +12V and GND wires, so you could plug it and unplug it all day long and not do anything as long as the PSU is in standby mode. Something else killed his system.
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