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Computer won't boot up. power supply issue?

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  • Power Supplies
  • Computers
  • Boot
  • Components
Last response: in Components
April 28, 2012 10:52:26 PM

I shut my computer down earlier this week and it won't boot up. I push the button and nothing happens. No fans or anything. The only thing that comes on is the green light next to the plug in the back. And the funny thing is when I unplug it, the light stays on for up to 30seconds. And it was blinking at one point. I've tried the voltage switch, cleaning out the dust, changing the battery, checking the wires, had my harddrive tested, changed power cords and still nothing. I was told that if it was a motherboard issue, I would hear a beep code. And I never heard any beeps. At all. Does it sound like power supply issue? Also, a few weeks ago, it shut down randomly and kept doing so immediately after I'd push the power button. It finally stayed on after a few tries. I do believe it's related. By the way, I have an HP pavilion slimline s7700n.

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a c 124 ) Power supply
April 28, 2012 11:46:12 PM

thepoetlucy said:
Thanks. My gut tells me it's the PSU. I just want to be sure before I buy.

When you buy a new PSU, make sure it is a good reliable brand. Corsair, Seasonic, Antec. Newegg frequently has good sales. Make sure that the PSU will fit inside the slimline case (Form factor).
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April 29, 2012 1:14:51 AM

Ubrales said:
When you buy a new PSU, make sure it is a good reliable brand. Corsair, Seasonic, Antec. Newegg frequently has good sales. Make sure that the PSU will fit inside the slimline case (Form factor).


I will definitely shop carefully.

S/N: I Just took a look inside a the connecter on the PS (the one with 24 pins) and one of the pins inside is missing. I'm assuming that would cause a problem?
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a c 124 ) Power supply
April 29, 2012 1:20:24 AM

thepoetlucy said:
I will definitely shop carefully.

S/N: I Just took a look inside a the connecter on the PS (the one with 24 pins) and one of the pins inside is missing. I'm assuming that would cause a problem?

No. That is a blank; fifth one from the end; don't know the pin number (closer to the center).
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April 29, 2012 1:30:21 AM

Ubrales said:
No. That is a blank; fifth one from the end; don't know the pin number (closer to the center).


Gotcha. Thanks.
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April 29, 2012 4:12:09 PM

When I plug the ethernet cable from my internet modem, it acts normally, as if it's being powered. Same with the monitor, it recieves power but says there's no signal. This is so confusing.
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a c 124 ) Power supply
April 29, 2012 6:12:56 PM

thepoetlucy said:
When I plug the ethernet cable from my internet modem, it acts normally, as if it's being powered. Same with the monitor, it recieves power but says there's no signal. This is so confusing.

Were you able to use the trouble-shooting guide that I posted above? That will definitely help!

If you have a good power supply installed, check all the connectors and ensure that they are well seated. The 24-pins connector is a little hard to plug in and get seated. The latch must engage.

Then power ON. If you do not get a POST beep, then the motherboard is the issue.
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April 30, 2012 1:27:37 AM

Ubrales said:
Were you able to use the trouble-shooting guide that I posted above? That will definitely help!

If you have a good power supply installed, check all the connectors and ensure that they are well seated. The 24-pins connector is a little hard to plug in and get seated. The latch must engage.

Then power ON. If you do not get a POST beep, then the motherboard is the issue.


I tried some of them already but I'll take another look. I put the computer back together and plugged everything back in and now the green light in the back is blinking.
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a c 124 ) Power supply
April 30, 2012 1:49:32 AM

What green light is this? And did you get a POST beep? (single beep).
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April 30, 2012 1:56:45 AM

Now a yellow light is blinking around the power button and the green light next to the flash drive on the front is blinking. First time it's done that since this started.
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April 30, 2012 2:00:33 AM


Ubrales said:
What green light is this? And did you get a POST beep? (single beep).


The green light next to the PS. And I didn't get a beep, I still have the old PS in, which I suspect is bad.
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a c 124 ) Power supply
April 30, 2012 2:09:59 AM

thepoetlucy said:
Now a yellow light is blinking around the power button and the green light next to the flash drive on the front is blinking. First time it's done that since this started.

This blinking yellow light means that there is an external hard disk plugged into one of the USB ports. Some computers will not boot if there is an external HDD plugged into any of the USB ports. Two of my Dell desktops act this way. My other home built i7 computer has no problems booting even if there is an external USB HDD plugged in.
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April 30, 2012 2:21:27 AM

Ubrales said:
This blinking yellow light means that there is an external hard disk plugged into one of the USB ports. Some computers will not boot if there is an external HDD plugged into any of the USB ports. Two of my Dell desktops act this way. My other home built i7 computer has no problems booting even if there is an external USB HDD plugged in.


Thing is, I don't have anything plugged in The USB ports right now lol. This is so odd.

I really appreciate your helping me, btw.
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a c 124 ) Power supply
April 30, 2012 2:25:33 AM

thepoetlucy said:
Thing is, I don't have anything plugged in The USB ports right now lol. This is so odd.

I really appreciate your helping me, btw.

The reason I mentioned that is because sometimes I forget that the external HDD is plugged in and I try to power up and start the computer. Nothing happens. After my initial panic subsides, I unplug the ext. HDD and then all is fine and the computer starts without a hitch.
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Best solution

a c 124 ) Power supply
April 30, 2012 2:26:42 AM

Go ahead and replace the PSU with a Corsair, Seasonic, or Antec. As you mentioned, this may be the issue.
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May 2, 2012 12:25:55 AM

Ubrales said:
Go ahead and replace the PSU with a Corsair, Seasonic, or Antec. As you mentioned, this may be the issue.


Bought a new PSU today (luckily a local computer repair shop had one slimline model available for a woman who changed her mind at the last minute) and my computer is working beautifully now. Posting this from it. :bounce: 

Thank you SO much for your help.
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May 2, 2012 12:28:45 AM

Best answer selected by thepoetlucy.
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a c 124 ) Power supply
May 2, 2012 12:54:47 AM

Thank you! Great that everything is fine!
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