Major PC problems, New Build

S

skyline889

[H]ard|Gawd
Joined
Oct 15, 2007
Messages
1,368
Well I finally got around to building my new computer and what do you know, it won't post. If I plug in the 12v atx line at the top of the mobo, the computer will power on and off every 3-5 seconds and won't boot and if I unplug that line, the computer components will turn on but the cpu fan will start after a delay and there will be nothing showing on my monitor. This had me very confused as I thought that the computer wasn't supposed to boot without the 12v line plugged in. :confused: I tried both my new E6600 and my olf P4 560J and the results were the same. I also tried two power supplies, I tried removing each component, and I checked the leads from the case power switch to the mobo and each to no avail. I'm completely stumped, do I just have a doa mobo? Any help would be really, really appreciated.
 
Please list all the components in your system so people can better undersatnd what you're working with. In a situation like this it is best to be as thorough as possible.
Thanks
 
is ur PSU plugged into its own wall socket or does it live on a powerboard... make sure u have it on its own socket.....

have you reset the bios... you should do that

does the power button get stuck in anyway? swap it with the reset button and try to power it on then...

what system components do you have in this computer? is your power supply powerful enough? get both of your power supplies out and use one to plug on the motherboard and one onto the cpu (use your 7600GS if your new card is a real power hungry beast eg 8800)... to turn on the second psu first unplug it from the wall, get a paperclip or hairclip or similar metal prong and gently feed one end into the pin with the GREEN wire on the motherboard connector and the other end into ANY of the BLACK (ground) pins on the motherboard connector.... now plug in the psu and switch it on (after you have connected it to the cpu 12v plug)... this is safe UNLESS you plug it in the wrong wires make sure one is GREEN and the other is BLACK... dont touch the pin or let it earth (its only low voltage but its best to be safe)... DO NOT DO THIS WHEN THE PSU IS PLUGGED IN... dont plug in hdds, dvds etc only the essentials for this test (mobo,ram,cpu,vga)

have you tried booting it up with only 1 stick of ram... and then booting it with only the other?

otherwise just rma the board :D
 
Sorry for not listing earlier, the components are;

Gigabyte GA-P35-DS3R
Intel E6600
OCZ SLI-Ready 2x2gb DDR2 800
EVGA 7600GS
Raptor 150gb

I've tried disconnecting everything and going component by component but the results are the same. Unless the 12v ATX is unplugged, the computer will keep restarting. Also, I ran into another problem last night. When I tried to reassemble my old computer, the one listed in my sig, it too would not boot. The components will spin up for about 5 seconds and after that it'll just shut down. I got it to display the post this morning for a few seconds but after that it was back to the shutdown after 5 seconds and no display. Maybe I just had really bad luck last night? :(
 
Take your motherboard out of the case and put it together again on top the box that came with your motherboard. You want to check for shorts to the case. Also, remove the heatsink and reapply it. It could also be a Bios issue. Does your chipset have dualbios? If so, try to restore the bios from the backup chip. Good luck!
 
I also had a problem like yours and it was because i had touched the board in the wrong place when transferring it to a new case. when i booted it up it shorted and would only work if i had 20pins out of 24pins in the ATX power connecter perhaps you caused an ESD If that is the case then get a new board or try and return it
 
Thanks for the help guys, I got the old rig running again. Turn out one of the clips had come off the HSF so the chip was being shutdown by the thermal sensor.

About the new build, the RAM and PSU are from my old build so I've tested them to be working ok. I also live in Hawaii and I've never had static problems in my valley before (The humidity level is around 80%). I think the board may have just been damaged in shipping since there was only one layer of bubblewrap around the box. Luckily though, the seller was really decent and is not only sending me a replacement but he's sending me the upgrade P35C-DS3R! Hopefully this one will work ok! Anything I should keep in mind for the install this time around though? Though I've rebuilt my computer before, this will be my first build from scratch!
 
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