Solved My PC won't start although Ive replaced my Power supply

June 13, 2013 at 06:38:20
Specs: Windows XP SP3, Intel Dual Core 2GHz( I think) and 3GB RAM
I thought the reason why my PC won't start is because it wasn't getting any power, so I replaced my 400W Mercury Power supply with a 450W. I re-install everything, plug it in aaaand nothing... I just don't know what it might be. Maybe my motherboard?

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✔ Best Answer
June 13, 2013 at 11:04:17
I found a link for the specs on that PSU (first link below). Shows it has 2 +12V rails @ 14A & 16A. While that is not idea the GT440 only draws 65w (about 5.5A@12V) so the power supply should theoretically be OK.

As riider pointed out above, the GT440 should not cause the system to overheat. The specs on the GPU (second link below), show the temperature can rise to 98c, which is hot enough to fry an egg.

If the system is not currently running then it is hard to troubleshoot. I suggest you open the case with the computer unplugged and then reseat all cards, cables, RAM. The heatsink on the CPU may have be dislodged when you installed the GT440 or the PSU. You may want to remove it, clean off all paste/pad and apply new thermal paste according to the instructions for your processor from the link below. You can use any brand paste.

Be sure you have the auxiliary power connector plugged into the motherboard, as well as the primary 24 pin connector.

http://www.superchannel.co.za/?post...

http://www.geforce.com/hardware/des...

http://www.arcticsilver.com/instruc...



#1
June 13, 2013 at 07:25:27
Did you previously change anything inside the case?

Describe what, if anything, happens when you attempt to start the computer.


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#2
June 13, 2013 at 07:32:48
How did you come to the conclusion that the PSU was bad? Mercury is a junk brand so it's very possible. Is the 450W replacement a quality brand?

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#3
June 13, 2013 at 07:34:31
Well, back when my PC actually started there was a problem with my OS for some reason, it only loaded to a point. My brother saw it only loaded to a certain file, he fiddled with the thing for a while and then he finally gave up. When I wanted to start it, the machine went on and not my screen. My pc had been struggling to start for quite some time leading up to that point, to be honest, but after that it wouldn't even start. I thought it might be my power supply because I got a new GPU a couple months back and it caused my PC to over heat and re-start almost every 5 minutes when I played games... THAT coupled with Power failures that happen a lot in South Africa, it made sense that it was the PS.. And it made odd noises, too

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Related Solutions

#4
June 13, 2013 at 08:10:36
What is the model of your new GPU?

What is the model of the new power supply?


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#5
June 13, 2013 at 08:40:38
Nvidia and I don't know. My Dad pitched up with a new chassis, it says Yama on. Never heard of them. But there's a light on the front of the case that is glowing red, so power is flowing.. Nothing is happening though

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#6
June 13, 2013 at 09:15:02
"I got a new GPU a couple months back and it caused my PC to over heat and re-start almost every 5 minutes"

Did you confirm overheating by looking at the temperature readings? Or are you just guessing? It's very unlikely it overheated due to the GPU but it may be overloading the PSU & causing random reboots. There's not much we can do if you can't provide make/models & specs for your PC, GPU, & PSU.


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#7
June 13, 2013 at 09:51:34
You need to open the case and get numbers off the power supply and the graphics card.

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#8
June 13, 2013 at 09:52:37
Well, if your whole system is room temperature except your GPU that's hot enough to cook an egg on, then I suppose you would also guess its the GPU. I can't exactly check my PC specs flawlessly, seeing as its been out of commission for a while.

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#9
June 13, 2013 at 10:09:10
Let me rephrase, that last one was a bit mean ( I apologize).
My Graphics card is a 1 GB Nvidia GT440, my CPU is a Duel Core Intel 1.6GHz (I'm unsure about this one because it doesn't have a label specifying it). My Power supply is a 450W Yama(don't ask, I don't know either). And my motherboard is MSI. That's about all that I can tell you, I guess

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#10
June 13, 2013 at 11:04:17
✔ Best Answer
I found a link for the specs on that PSU (first link below). Shows it has 2 +12V rails @ 14A & 16A. While that is not idea the GT440 only draws 65w (about 5.5A@12V) so the power supply should theoretically be OK.

As riider pointed out above, the GT440 should not cause the system to overheat. The specs on the GPU (second link below), show the temperature can rise to 98c, which is hot enough to fry an egg.

If the system is not currently running then it is hard to troubleshoot. I suggest you open the case with the computer unplugged and then reseat all cards, cables, RAM. The heatsink on the CPU may have be dislodged when you installed the GT440 or the PSU. You may want to remove it, clean off all paste/pad and apply new thermal paste according to the instructions for your processor from the link below. You can use any brand paste.

Be sure you have the auxiliary power connector plugged into the motherboard, as well as the primary 24 pin connector.

http://www.superchannel.co.za/?post...

http://www.geforce.com/hardware/des...

http://www.arcticsilver.com/instruc...


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#11
June 13, 2013 at 11:09:27
Thank you :) I'll let you know if I make it work.

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#12
June 13, 2013 at 11:15:46
Looks like OtheHill beat me to it.

"if your whole system is room temperature except your GPU that's hot enough to cook an egg on, then I suppose you would also guess its the GPU"

Most GPUs have a max safe operating temp of approx 100C but most operate at approx 40-50C unless under heavy load. NVIDIA rates the GT 440 max temp at 98C.

http://www.geforce.com/hardware/des...

Your GT440 is a fairly weak, low power card. It uses approx 7W at idle & 65W under full load. A 400W PSU should be plenty for that card unless it's a real POS. See the following:

http://www.techpowerup.com/reviews/...

http://www.techpowerup.com/reviews/...


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#13
June 13, 2013 at 13:53:24
You mentioned in your # 3 that it had been 'struggling to start for quite some time. . .' and the new PSU didn't fix that. If you can open up the case take a look at the capacitors, especially those surrounding the CPU. The capacitors will look like very small soda cans. Sometimes motherboard manufacturers use low quality capacitors to cut costs and often they fail. When approaching failure they usually get a 'puffy' look to them (again using the soda can analagy) like a soda can that's been in the freezer too long and is about to explode. Sometimes you'll notice some dried stuff on top of them indicating they're leaking.

Anyway, once that starts happening the motherboard starts acting up. Sometimes it starts up and sometimes it doesn't.

Since it wasn't the PSU and may not be the new video card you're pretty much left with the motherboard.

DAVEINCAPS - Made with REAL high fructose corn syrup.


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#14
June 13, 2013 at 15:43:20
We got it to work, thanks guys. Even though you didn't have much to go on :) much appreciated..

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#15
June 13, 2013 at 19:07:37
Please elaborate on what fixed it so others who read it may get some hint on what might help them. Please choose a best answer so the post will be marked Solved.

You have to be a little bit crazy to keep you from going insane.


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#16
June 14, 2013 at 02:27:09
oky, we took everything apart and reconnected the power supply to the motherboard according to the manual. We also took apart my GPU and my brother checked if there might not be a short circuit, there wasn't but it was pulling a lot of power. We first started it without my GPU, and it ran, connected my GPU and for a moment it didn't but its up and running again. so the only thing we changed was the Power supply and the GPU was cleaned and checked.

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