Upgraded to GTX 670, second monitor no longer detected.

[Leimone]

So I just upgraded from a GTX 560 TI to a GTX 670 and now my computer can't detect my second monitor.
My main monitor is plugged in via DVI while my second computer is plugged in via HDMI.
Anyone who knows how I can fix this?
I've been on nvidia control panel and tried finding my second monitor there on the "multiple monitors" section, no second monitor there either.

I'm in desperate need of help

 

[essenbe]

In your monitor menu is the proper input method selected? Also, try right clicking on a blank part of the desktop and select resolution. See if that detects both monitors.

 

[Leimone]

In your monitor menu is the proper input method selected? Also, try right clicking on a blank part of the desktop and select resolution. See if that detects both monitors.

Yes, it's set on the standard HDMI setting, tried all the different ones as well.
Already tried it, it doesn't detect the second monitor.