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Computer won't start. New power supply

by themilkykid / April 7, 2013 6:52 AM PDT

ok so when i try to turn my pc on it starts for like a 10th of a second and then it stops. The lights turn on and everything but nothing happens. I was using it one day and the whole thing just shut off of me and it will not turn on since. Can someone please help me?

I thought it was the power supply so i went out and bought a new one for 70 euro plus it has 50W of power more then my old one.

I took apart everything and put it back together, cleaning everything on the way.

I am running a MSI P45 Platinum
I curently do not know what CPU I have.
(2x2) DDR3 + (2x2) DDR3 ram
4850 Radion graphics card
Brand new Corsair PSU.

I plug out the 8pin from the MoBo and when i turn it on it seems to spark up with all the LED's and Fans running at full speed although their is no graphics to the screen. I really need your help.

Thanks a lot.

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(NT) Does the GPU require power from the PSU ?
by VAPCMD / April 7, 2013 10:56 AM PDT
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by themilkykid / April 7, 2013 5:08 PM PDT

Do you mean my graphics card? If so yes I have 2 six pci-e pins running into it

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(NT) And no separate power?
by Kees_B Forum moderator / April 7, 2013 5:29 PM PDT
In reply to: Re: GPU
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As far as I know no
by themilkykid / April 8, 2013 12:46 AM PDT
In reply to: And no separate power?

How would I know ? It worked all the time when I just connect it to the motherboard and the 2x 6pins

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Link shows a power connection to the video card.
by R. Proffitt Forum moderator / April 8, 2013 1:01 AM PDT
In reply to: As far as I know no
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by themilkykid / April 8, 2013 3:54 AM PDT

Hi I am very sorry my graphics card is actually the ATI Sapphire HD4870

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Link please.
by R. Proffitt Forum moderator / April 8, 2013 4:13 AM PDT
In reply to: Here

Since I searched it the first time you should do the next search and supply us which card you have.

Also, you should tell if all THREE motherboard power connections were made.

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Very sorry
by themilkykid / April 8, 2013 6:37 AM PDT
In reply to: Link please.
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Sorry, no.
by R. Proffitt Forum moderator / April 8, 2013 7:12 AM PDT
In reply to: Very sorry
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by themilkykid / April 8, 2013 4:55 PM PDT
In reply to: Sorry, no.

Yes I have all 5 power connectors conneced

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Did you try doing a CLEAR CMOS ?
by VAPCMD / April 8, 2013 10:17 AM PDT

How old is the CMOS battery ?

Have another GPU to try ?

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by themilkykid / April 8, 2013 4:57 PM PDT

I have tried the CMOS battery from a different computer is well.

I have another GPU but it can't be that because the fans are running on it and the fact that the on board graphics should kick in when I boot without the GPU

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Now that we appear to have all the power connected.
by R. Proffitt Forum moderator / April 9, 2013 12:06 AM PDT

This is a custom home built so the next step is to take it out of the case and build it on cardboard to see if it's the usual case short.

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by themilkykid / April 9, 2013 3:31 AM PDT

Ok thanks. How would I figure if there was a short circuit?

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By placing it on the cardboard
by R. Proffitt Forum moderator / April 9, 2013 3:34 AM PDT
In reply to: Ok

If it does the same on the cardboard it's not the usual case short. It's what we are looking at. You reduce the number of parts and what parts are left are suspect.

The usual PC tech can get it down to about 4 parts. I'll write it a bit longer so you see what I mean.

When I'm trying to find out what part I strip the machine down to motherboard, power supply, CPU+heatsink and the motherboard speaker.

It should beep in protest. That's all of 4 parts and then I get to swap out those 4 one by one. Usually by this point I have a good idea which it is.

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by themilkykid / April 9, 2013 6:49 AM PDT

Will let you know how I get on tomorrow with it. Thanks for your help by the way

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Sorry for the typo. The last item on the list should be
by R. Proffitt Forum moderator / April 9, 2013 6:53 AM PDT


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