Strange GPU Problem in new build

chamanistan · Mar 19, 2013

Dear All,
I have a somewhat strange problem and I would be very grateful for any wisdom or insight you might offer. I've read the very useful computer startup FAQ on this site, and I have recently assembled a new computer:

Silverstone SG-07BW including 80+Bronze 600W PSU
ASUS P8Z77I Motherboard
Intel i5-3770K CPU
Noctua NH-L12 Cooler
2x8GB Corsair LP RAM
Panasonic Blu-Ray Drive
1TB WD HDD
128GB Samsung SSD (Primary)
* EVGA GTX680 2GB GPU

This was a first time build, and a tough one. Nevertheless I eventually assembled it and I'm happy to say it works extremely well - but without the GPU. I have now tried to install two different EVGA GTX680 GPUs in the PCI-E slot, and every time I do, the computer will not POST; the power comes on, CPU fans run on high, the GPU fan runs, but there is no output to monitor. Without the GPUs, the computer runs well - everything seems to be recognized, CPU temperatures are within parameters, et cetera.

So please help me out. I can't for the life of me figure what is wrong. The GPU should not be underpowered, because the Silverstone case is explicitly rated to run a GTX 680. Could it be that I received two dud video cards from Newegg? Or is it that my Motherboard's PCI slot is non-functional? Or is there some other simple, obvious thing that I do not know? I had built this computer for the purposes of gaming, so it is a bit frustrating that the most important component won't work. Please help.

mcnumpty23 · Mar 19, 2013

might be a silly question--but you wouldnt be the first to do it

when you put in the gtx680 you are connecting the monitor to the graphics card and not the integrated graphics?

skullcrush · Mar 19, 2013

Check GF on someone else's PC.
Check rated power if using dual gpu on sli.
Borrow a GF from someone and check your mobo.
If you cant isolate the problem check your bios settings.
Lastly contact GF and Mobo manufacturer.

chamanistan · Mar 19, 2013

Hi - Thanks for this. I put the card in the PCI slot, connected both 6-point pcie power cables; the fit seemed to be good. This board has a single pcie slot so no question of SLI; I plugged the monitor to the Mobo's HDMI out: no outcome; I plugged the monitor using the DVI-VGA adapter supplied: no outcome.

ittimjones · Mar 19, 2013

lol, yup, make sure you have the video cable on the graphics card, not the motherboard.

Also, bear in mind that you are at the very minimum system requirements for system power. I would recommend 100-200W more to the PSU. With the other stuff connected to the PSU, if you OC either the GPU or the CPU, you may hit the PSU max and have system crashes or BSOD.
http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-680/specifications

mcnumpty23 · Mar 19, 2013

you are not meant to plug it into the motherboard

you are meant to plug it into the graphics card

ittimjones · Mar 19, 2013

lol, yeah, i think ur messing urself up. The monitor will have separate sources/inputs like a TV. if you want to use HDMI, you have to specify that on the monitor, if you use a (typically w/ blue connectors) VGA cable, you have to specify that. If you use a (typically w/ white connectors) DVI cable you have to tune the monitor into the correct source/input.

Use the HDMI cable and plug it into the port that the GTX 680 has on it (NOT the port on the motherboard!!!). Also make sure that it is securely plugged into the Monitor's HDMI port. Turn on the PC. Wait 15 seconds. Turn on the monitor.

MAKE SURE it's plugged into the middle port on the left side of this picture.
http://cdn.thetechjournal.com/wp-content/uploads/images/1211/1353913131-evga-geforce-gtx-680-2gd5-ttj-2-2.jpg

and NOT into ANY of the ports in this picture!!!
https://www.asus.com/media/global/products/HZucw55lWQiBcdKV/l9AC8D91IyFZ0bJz_500.jpg

chamanistan · Mar 19, 2013

I think I was trying to say I tried both options. I just tried this again, and now it seems I have a catastrophic problem. Instead of trying to plug it into my DVI port, I plugged everything in and then attached the monitor to the HDMI port with an HDMI cable. Nothing happened - this time it didn't even power up. SO I removed the card, and it did not power up. The green LED on the motherboard came on for a second and then went off - the fans haven't started. It has completely stopped working. What is going on?

mcnumpty23 · Mar 19, 2013

unplug power from wall

push on /off button on pc to discharge capacitors

plug in power and turn on

does that help?

chamanistan · Mar 19, 2013

No, it doesn't, sadly. A green LED popped on the MOBO the minute the computer was connected to a power outlet. Now it doesnt come on at all no matter what I do - I have changed outlets etc. This happened only after I plugged the HDMI on the GPU to the Monitor. I'm out of my depth here, have no idea whats going on.

mcnumpty23 · Mar 19, 2013

dont know what country you are in

but if no power at all is getting to it

some countries use a fuse in the plug--if yours does then check the fuse

chamanistan · Mar 19, 2013

I'm in NYC. The power is connected to an adapter which plugs to other things, all of which have power. So it is just the computer, and it happened just after the card was plugged in and connected via HDMI. So - could the motherboard have been damaged somehow? Or is there a PSU failure of some sort?

mcnumpty23 · Mar 19, 2013

no fuses in the usa are there?

in the uk all the plugs have a fuse in them

can test the psu using the paperclip trick

http://www.overclock.net/t/96712/how-to-jump-start-a-power-supply-psu-test-a-power-supply-and-components

chamanistan · Mar 19, 2013

OK - so I have fiddled and poked about, pushed all the power cables in I'm glad to report the motherboard has power. The Graphics card is out. I am back where I started. Should I just try putting in the card again, etc. etc - or can we conclude that there is a power supply issue or a motherboard pcie issue?

mcnumpty23 · Mar 19, 2013

cant conclude that there is a power supply issue or a motherboard pcie issue 100%

would have thought that psu would power a gtx680

really you need access to a lower power graphics card to double test with

if that works its your psu

chamanistan · Mar 19, 2013

Thanks all. On a second try, I switched around the PCI-e power cables on the graphics card. It shouldn't have made a difference, but ... voila, the system is running. However, as a poster pointed out, at least some of my woes might come from the fact that the Power Supply is supposedly only barely adequate. This might be a factor to consider for those of you who are planning to build SFF Mini-ITX systems with modern video cards; I'm certainly not very confident about this system yet.
But -- thank you very much, everyone.

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