Installed new Mobo & CPU, now GPU wont work correctly.

SuperSushix

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Mar 5, 2013
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Hey Forum,

So I decided to upgrade my cpu today from a Intel Core i7-3770 to an i7-4790k. My motherboard was outdated and wasn't compatible so I also went and bought a MSI Z97 Gaming 3 motherboard. After spending a while pulling my computer apart, putting the new CPU in the new mobo and attaching all power cables and my GPU (Gigabyte Geforce GTX 780).

Immediately ran into a bunch of issues (Keyboard/Mouse cutting out, only 1 monitor working out of 2, internet not connecting etc.) but most were fixed when I managed to get the correct drivers installed. I am now left with 1 final issue that is making my computer useless to me that I urgently need fixed.

My graphics card is connected fine, the fans are running and is powered. When I open BIOS it even tells me the graphics card connected in the PCIe x16 slot. Problem starts though when I continue past the BIOS screen. I notice immediately that only 1 of my monitors work at a time, I can connect both without the other and they work but together only one of them bothers to connect. As I continue to login to my computer you can already tell that everything is sluggish and that the video card isn't doing anything. I try and watch a film and I get horribly pixelated/distorted quality and when I try and open the NVIDIA control panel nothing shows and no video card is shown in System Information or Device Manager.

To top it all off for some reason my Windows is now not genuine and I don't think I still have the product key, but I guess I'll sort that out later. Anyway, anyone out there who thinks they know what my issue is? As I said, really need this fixed ASAP!

Things I've tried:

  • Resetting CMOS
    Unplugging, replugging, checking cables etc.
    Gone into advanced BIOS settings and changed an option that would allow 2 monitors with no change.
    Changed from PEG to IGD which resorted in neither monitor working and me having to reset CMOS.
 

A12MO12

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Aug 10, 2012
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are both monitors connected to video card? If you're using the video card's HDMI port for the first monitor you'll need to use DisplayPort or DVI to connect to the second (or a DP->HDMI or DVI->HDMI adapter).

Also try switching the cables you are using for the monitors to see if that is the problem.
 

SuperSushix

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Mar 5, 2013
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10,510


Yeah my main monitor is using HDMI and my second is using DVI, both connected to video card. Had it working perfectly before, its still the same monitors and video card as I was using before.

Regardless I attempted switching cables but nothing changed. Honestly the monitors aren't that big of a concern, I just need to figure out why my card isn't working once windows loads.
 

A12MO12

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Aug 10, 2012
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If its not cable or monitors could be one of the display ports on the card or the card has problems.
That card has DVI-I*1, DVI-D*1 ,DisplayPort*1 ,HDMI*1. Anyway to try and connect 2nd monitor to another port? If you do this and still get monitors not being supported card is messed up.

Would probably RMA the card after doing that. Getting bad quality in movies is not a good sign, should try to see if it happens on several different sources because the RMA process is a quite a pain.
 
If I'm reading this correctly

1. You dismantled computer ,removed motherboard - replaced with new motherboard & CPU.
2. Plugged everything back together as it was .
3. Including the hard drive with the existing install from your old setup.

If this is the case then step 3 is your problem mate.
You can't change chipsets completely ( which you have done going from sandy/ivy bridge 1155 to haswell 1150) & expect things to work.
You need a completely fresh windows install!!