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Windows 7: PC doesn't turn on after powering off

23 Feb 2014   #1
cedsays

Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1
 
 
PC doesn't turn on after powering off

Hi

I powered down my computer and it does not turn back on. At first it would power on for maybe a second. I could hear and see the fans spin. There was also no beep the first few times. Confused, I tried again to turn it on again and the same thing happened. Now nothing turns on. The fans don't spin and no lights turn on. The only thing I've noticed was the green light on the motherboard stays on if the powerswitch to the PSU is on. I've tried unplugging everything and replugging one by one. I've tried a different PSU also. I also tried the paper clip test. I'm not sure how accurate that is but for the current PSU (750w) the fan spins for maybe 4 seconds then it stops. On the 450w the fans continue to spin (paper clip test for both) So I tried to switch out the PSU thinking it would help and no luck. Sorry if this is jumbled up and doesn't make sense to anyone.


My System SpecsSystem Spec
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23 Feb 2014   #2
Mellon Head

Win 7 Pro x64/Win 10 Pro x64 dual boot
 
 

Have you checked the power switch connector to the motherboard? Maybe it has come loose.

I've never heard of the paper clip test before. Please enlighten me.
My System SpecsSystem Spec
23 Feb 2014   #3
cedsays

Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1
 
 

Quote   Quote: Originally Posted by Mellon Head View Post
Have you checked the power switch connector to the motherboard? Maybe it has come loose.

I've never heard of the paper clip test before. Please enlighten me.
With the PSU not connected to a power cable and switched off You take a paperclip and get it in an U shape. One side goes into green and one into black. Now plug it in and switch it on and you have a running PSU. Can you explain the power switch connector on the mobo?
My System SpecsSystem Spec
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23 Feb 2014   #4
Mellon Head

Win 7 Pro x64/Win 10 Pro x64 dual boot
 
 

The power switch connector on the mobo is a header that has your power switch, HDD LED, and reset switch connectors from the front panel attached to it. It looks like this:

PC doesn't turn on after powering off-power-switch-2.jpg

Wired up, it looks like this: (The red and black twisted pair is for your case speaker.)

PC doesn't turn on after powering off-power-switch-3.jpg

They are pretty much all wired in the same way. In your mobo manual you'll probably see a picture that looks like this:

PC doesn't turn on after powering off-power-switch-1.gif

Have a look inside your case and try to find the header. It's usually on the front side of the board toward the front side of the case, or along the side of the board. Most of them are toward the front of the case. Make sure that the power switch connection is securely plugged in.


My System SpecsSystem Spec
23 Feb 2014   #5
cedsays

Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1
 
 



Hopefully this is what you were talking about. There was no black and red but this.
My System SpecsSystem Spec
23 Feb 2014   #6
Mellon Head

Win 7 Pro x64/Win 10 Pro x64 dual boot
 
 

Looks like the right connector. johnsmith45jock reminded me that there is an easy way to test the front power switch. Unplug the power switch wires from that connector on the motherboard and short the two pins together. If the power switch is bad, the computer should start up and stay running. The power switch is momentary, so you just need to short the pins for a half second or so.

Try that and see if it works for you.
My System SpecsSystem Spec
23 Feb 2014   #7
cedsays

Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1
 
 

Quote   Quote: Originally Posted by Mellon Head View Post
Looks like the right connector. johnsmith45jock reminded me that there is an easy way to test the front power switch. Unplug the power switch wires from that connector on the motherboard and short the two pins together. If the power switch is bad, the computer should start up and stay running. The power switch is momentary, so you just need to short the pins for a half second or so.

Try that and see if it works for you.
I've tried it to the best of my ability and got no results.
My System SpecsSystem Spec
24 Feb 2014   #8
AmericanPharaoh

Windows 7 Home Premium 64-bit
 
 

Replace the Motherboard. If you're confident that your wall power, power supply, and power button are working, it's likely that there is a problem with your PC's Motherboard and should be replaced.

John
My System SpecsSystem Spec
24 Feb 2014   #9
cedsays

Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1
 
 

It was only a matter of time before it kicked off. Going to be a long 4 months until I can afford it. Shall I mark as solved or leave open for a few month until I get it fixed?
My System SpecsSystem Spec
25 Feb 2014   #10
AmericanPharaoh

Windows 7 Home Premium 64-bit
 
 

Is this the same computer you have listed in your system specs?

Motherboard: ASUSTeK Computer INC. M4A77TD

Some of our other members may have some additional comments to add. So keep the thread open for awhile longer.

If money is an issue, maybe go with Manufacturer refurbished with 60 day warranty. Cost is about $50. for your Mobo.
My System SpecsSystem Spec
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 PC doesn't turn on after powering off




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