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New build will not power on need some ideas.

J

jamesdsimone

Golden Member
I just signed up to this forum. I hope I can get some help. I just finished my new build but it will not power up. The USB mouse lights up so the MB is getting some power. When I hit the power button the CPU fan attached to the MB CPU fan power moves slightly but then stops. It might move about 1/8 of a rotation. I have an ASUS board(don't have the exact model but I can get that if it makes any difference) FX8350/16 gigs of 1866 DDR3 with 3 hard drives, a DVD drive and crossfired 7970's. Any ideas? I was going to get a new power switch to see if it's simple as that. I have a 750 watt power supply. I am thinking that might not be enough but that should not keep it from posting.
 
The wattage of the power supply is fine but not really what would be causing a potential issue. Is this supply purchased new or was it previously used (and known to be good)?
 
The power supply is new so it could be a bad power supply. Two of the hard drives are used and worked. One is new. The video cards are used. I was going to try a new atx switch since I can pick that up for 3 bucks at Microcenter. Can I assume not powering up is either the power supply or switch. Can I rule out a bad mother board at this point?
 
Don't get a switch. You can power up the system by momentarily shorting across the two pins the switch connects to.

Disconnect everything but the processor and the cooler for same (make sure the fan is plugged in), one video card (if it has onboard, better to use that for this test), one stick of RAM and the Power Supply making sure all power connectors on the motherboard are plugged in.

See if it will start. If not, reset the BIOS according to how the manual spells out to do so. If it still won't start, remove the motherboard from the case and try again with the bare minimum connected as outlined above.

Do you know for certain that your motherboard, on the BIOS revision it is at, supports your processor? Do you know for certain that your motherboard and RAM are compatible with each other?
 
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You can rule out the power switch by simply connecting and using the reset switch instead of the power switch, but I hardly doubt that the power switch is the issue.
Most of my brand new customer builds with similar symptoms end up with faulty DOA psu's most of the time and faulty motherboards rarely, but you are using 2 GPU's and this makes guessing more complicated.
I would start troubleshooting by using only one RAM module and one GPU ...
 
First thing I would do is eliminate the crossfired 7970's. Start with just one video card and see if it posts.
 
Pretty sure your CPU power cable isn't correctly connected. And as mentioned above, testing a new rig with Crossfire is not the ideal first step. Might as well pull all but one stick of RAM while your in there removing one of your video cards.

It's not the power supply, and it most certainly isn't the power button.
 
I've also seen those symptoms from a bent cpu pin. You may want to take it out and verify all the pins look intact.
 
Thanks greatly eveyone for all the ideas. Hopefully I will have some time this evening to try to trouble shoot this thing. I will report back as soon as possible.
 
Here is the update. Unfortunately I still can't get the computer to POST. I reset all the power cables. I pulled one of the video cards and one of the ram modules. I had some extra ram sitting around so tried a different ram module. I pulled the CPU and verified all the pins were intact. I had an extra CPU which I tried also. The only other thing is that when I hit the power button the CPU LED on the MB flashes but doesn't stay on. The MB manual says that if there is a problem with the CPU then the LED should stay on. Any more ideas? This is getting very frustrating.
 
Have you pulled the board from the case and tried to power it on outside of the case? It could be that the board is somehow shorting inside of the case (improper or missing mounting screw) and it will work outside of the case. Try pulling the motherboard out and start it with no HDDs hooked up along with the 1 stick of RAM, GPU & CPU. Remember to put it on something non conductive, such as a wood table or if need be a piece of cardboard (the outside of an ESD bag is conductive btw).
 
make sure you have the eight pin connector on the upper left of your mother board connected to a plug or plugs that have cpu on them . Other than that check for on standoff that should not be there as it will short out the mobo .
 
"Is the cpu fan plugged into the cpu fan header?"

If plugged in to the wrong header, the board may think the cpu is thermally unprotected. Some boards are very picky about which header is used. The proper header is usually labeled as such.
 
Thanks for the additional advice. Yes 8 pin connector is plugged in. I will check some of these other things and report back.
 
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