Power to motherboard

murderous1 · Post by **murderous1** » Thu Mar 29, 2007 8:49 pm

Hi...i just built my first system

Corsair 520W PSU
1 Gig Ram
7900GS Vid Card
Western Digital HDD
Samsung Dvd writer

now i hooked everything turned it on and nothing....took off HDD, Dvd Writer....turned it on nothing....so i just hooked up the motherboard CPU,Power Switch and turned it on....nothing...no fans turning, no lights no nothing. Psu power is connect, 24 pin cable connected, 4 pin 12v connected...im using a

Gigabyte 965P DS3 w/
CORSAIR CMPSU-520HX ATX12V v2.2 and EPS12V 2.91 520W Power Supply

any help is appreciated

Sparky · Post by **Sparky** » Thu Mar 29, 2007 9:05 pm

Have you checked the power switch (rocker switch) on back of PSU?
How about the voltage switch? Set to 120v not 240v?

murderous1 · Post by **murderous1** » Thu Mar 29, 2007 9:08 pm

No Rocker Switch
its auto sensing 100-240V

Sparky · Post by **Sparky** » Thu Mar 29, 2007 9:14 pm

If you have access to a multimeter you could use the probes to test one of the power connectors coming off the PSU that's not in use to see if there is any output from the PSU.

murderous1 · Post by **murderous1** » Thu Mar 29, 2007 9:20 pm

Yes i've tried that...testing voltage we got 2.51 volts coming out. I dont know what its supposed to be tho

SAMSAMHA · Post by **SAMSAMHA** » Thu Mar 29, 2007 11:28 pm

2.5 seems really low for any rail. The rails should be 3.3, 5, and 12v. the number shoudl be really close to these 3 numbers, if you get 2.51, that's way under the number.

Do you hear beeping sound? If not, then either your mobo, cpu or psu is bad.

Dragon_Cooler · Post by **Dragon_Cooler** » Fri Mar 30, 2007 9:43 am

Try reversing the power connector to the motherboard. I bet your polarity is wrong. I.E. you have negative on positive.

murderous1 · Post by **murderous1** » Fri Mar 30, 2007 10:52 am

it only goes in 1 way :/ i dont hear any beeping sounds nor are the fans spinning....the fan on the psu isnt doing anything

kenc51 · Post by **kenc51** » Fri Mar 30, 2007 11:00 am

Is the motherboard attached to the case? If so, one of the stand-offs could be making contact with the bqack of the board and causing a short......or a screew came loose or something.

set it up on the anti static bag the board came on with only the cpu/hsf. memory and PSU. If it still doesn't boot, test with one stick of ram and also in each slot. then with the other sick of ram.
If still no-go, re-seat the CPU and heatsink.

murderous1 · Post by **murderous1** » Fri Mar 30, 2007 11:23 am

I just put a piece of solder into the green and black pin on the 24 pin atx connector on the PSU. The fan does not turn on...now that means that the psu is defective right? Im pretty sure it does but i just wanna make sure before i get a rma from newegg.

kenc51 · Post by **kenc51** » Fri Mar 30, 2007 12:19 pm

murderous1 wrote:I just put a piece of solder into the green and black pin on the 24 pin atx connector on the PSU. The fan does not turn on...now that means that the psu is defective right? Im pretty sure it does but i just wanna make sure before i get a rma from newegg.

Yep....

Darkstar · Post by **Darkstar** » Fri Mar 30, 2007 12:25 pm

If you have a spare PS around, you might want to hook it up to make sure the rest of the hardware is ok.

Post by **dicecca112** » Fri Mar 30, 2007 1:10 pm

well seeing nothing turned on he should be fine. This is the first Corsair PSU I have heard of coming DOA.

Darkstar · Post by **Darkstar** » Fri Mar 30, 2007 1:14 pm

Should be , cant hurt to be sure though. Long time ago i shorted out a MoBo with a Bad PS. (it didnt seem to turn on either)

Dragon_Cooler · Post by **Dragon_Cooler** » Fri Mar 30, 2007 2:42 pm

murderous1 wrote:it only goes in 1 way :/ i dont hear any beeping sounds nor are the fans spinning....the fan on the psu isnt doing anything

no no no i am talking about your wire leads for your power button and reset button ETC... Make sure you have the power leads facing the right way.

Post by **dicecca112** » Fri Mar 30, 2007 3:14 pm

Dragon might be on to something he means the connections from the case to the mobo, the ones that connect your case to the motherboard

murderous1 · Post by **murderous1** » Sat Mar 31, 2007 9:17 am

Oh yea....yes i double checked and triple checked that stupid little thing. Im more than positive its in the right place.

Holy crap i just re tested the psu and the fan spins....back to the board...

Dragon_Cooler · Post by **Dragon_Cooler** » Sat Mar 31, 2007 9:35 am

ok well if you checked.....did you actually change it? lol

murderous1 · Post by **murderous1** » Sat Mar 31, 2007 9:48 am

It was actually already in the correct position according to the tiny markings on the board and in the manual...i guess i'll change it anyway jsut to check...if the heatsink and/or the cpu is improperly installed will it not start?

***EDIT---Great News...Computer has finally started...thank you everyone for the advice/help on everything....The problem was that the Power from the case to the MOBO was wrong...Also i had to reseat the heatsink/cpu and clean it/put more thermal compound...Thx once again everyone I've been working on this thing for 3 days straight