Page 1 of 1
Power to motherboard
Posted: Thu Mar 29, 2007 8:49 pm
by murderous1
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
Posted: Thu Mar 29, 2007 9:05 pm
by Sparky
Have you checked the power switch (rocker switch) on back of PSU?
How about the voltage switch? Set to 120v not 240v?
Posted: Thu Mar 29, 2007 9:08 pm
by murderous1
No Rocker Switch
its auto sensing 100-240V
Posted: Thu Mar 29, 2007 9:14 pm
by Sparky
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.
Posted: Thu Mar 29, 2007 9:20 pm
by murderous1
Yes i've tried that...testing voltage we got 2.51 volts coming out. I dont know what its supposed to be tho
Posted: Thu Mar 29, 2007 11:28 pm
by SAMSAMHA
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.
Posted: Fri Mar 30, 2007 9:43 am
by Dragon_Cooler
Try reversing the power connector to the motherboard. I bet your polarity is wrong. I.E. you have negative on positive.
Posted: Fri Mar 30, 2007 10:52 am
by murderous1
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
Posted: Fri Mar 30, 2007 11:00 am
by kenc51
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.
Posted: Fri Mar 30, 2007 11:23 am
by murderous1
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.
Posted: Fri Mar 30, 2007 12:19 pm
by kenc51
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....
Posted: Fri Mar 30, 2007 12:25 pm
by Darkstar
If you have a spare PS around, you might want to hook it up to make sure the rest of the hardware is ok.
Posted: Fri Mar 30, 2007 1:10 pm
by dicecca112
well seeing nothing turned on he should be fine. This is the first Corsair PSU I have heard of coming DOA.
Posted: Fri Mar 30, 2007 1:14 pm
by Darkstar
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)
Posted: Fri Mar 30, 2007 2:42 pm
by Dragon_Cooler
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.
Posted: Fri Mar 30, 2007 3:14 pm
by dicecca112
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
Posted: Sat Mar 31, 2007 9:17 am
by murderous1
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...
Posted: Sat Mar 31, 2007 9:35 am
by Dragon_Cooler
ok well if you checked.....did you actually change it? lol
Posted: Sat Mar 31, 2007 9:48 am
by murderous1
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
