MSI GTX 1080 not working -- possible issue with PSU?

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nsfwookiee

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Jun 4, 2017
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Current PC: https://pcpartpicker.com/list/gJxVVn

A bit of a noob here...

I upgrade my 970 into an MSI GTX 1080 but after installing (through the 6-pin connector) My PC will turn on along with the LED on the graphics card but my monitor wont find a signal (monitor says nothing is connected to it). I tried through DVI, HDMI, & DisplayPort. Even tried with a 2nd monitor and nothing working. When re-installing my 970 -- the monitors work just fine.

I have it running using a 6 pin connector from the PSU -- When trying to run it through a 6+2 pin connector my PC will turn on for half a second and shuts back down.

With a graphics card like this, am I supposed to have a 6 pin and a 6+2 pin connector plugged in? or am I supposed to able to run it either just the 6 pin or just the 6+2 pin?

Any ideas on how to fix this?
 
Solution
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I've used 2 cables running from the PSU that I used to connect the ASUS 970 that I already have and the 8pin connector worked perfectly fine (still does, currently have the 970 installed right now). But the same cables don't work on the 1080.
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pete_101

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The graphics card needs both connectors plugged in. So that means both a 6 pin and an 8 pin (or 6+2).
You said your computer turns off when using the 6+2, were you using just the 6 pin or did you use all 8 pins in an 8 pin socket? Your PSU is more then enough, so it shouldn't be the issue.
 
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nsfwookiee

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So I've powered it up 3 different ways now.

With JUST the 6 pin it powers on (PC and graphics card LED turns on) but the monitor doesn't recognize my PC no matter what port I use (DVI, DisplayPort, HDMI)

With ONLY 8 pin (6+2 pin), the lights and fans turn on for half a second and shuts down -- after that I'm unable to turn on the PC at all without having to cut the power out of the PC and trying again (which turns on for only half a second again)

with the 8 pin & the 6 pin connected -- I get the same results as when I try using the 8 pin only.

So for some reason my PC won't turn on when I have it connected to the 8-pin connection.
 
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pete_101

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That's strange. It's unlikely to be an issue with the card, unless the 8 pin is creating a short that's causing the PSU to shut off...but this is extremely unlikely. So it has to be somewhere in the 6+2 cable and the PSU. Do you have another cable that you can try? If not, then I just don't know what else you can try, you may need another PSU.

 
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nsfwookiee

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Jun 4, 2017
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I've used 2 cables running from the PSU that I used to connect the ASUS 970 that I already have and the 8pin connector worked perfectly fine (still does, currently have the 970 installed right now). But the same cables don't work on the 1080.
 
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Solution
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pete_101

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Aug 2, 2014
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Oh ok, so the 970 is a model that requires a 6 and 8 pin connector too? Well, it must be a fault in the card then, return it and get a replacement.

 
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nsfwookiee

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The 970 only requires an 8-pin connection - but yeah that's what I was afraid of. Thanks for the help though!
 
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