New Graphics card, dual screen not working!

itempotvlee

Honorable
Jan 14, 2013
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10,630
Hey guys I've recently changed my GPU and now my secondary monitor turns on and stays on but isn't displaying anything.

Specs: CPU - AMD Athlon II X2 3.4Ghz, (NEW) GPU - Radeon HD 7770 Ghz edition, (OLD) GPU - Radeon HD 6850, PSU - Ace 625w and Mobo - Gigabyte 78LMT USB3.

So when I had my old GPU both monitors worked fine. When I first got my second GPU they both worked fine until now both show they are on but one displays only a lit up black screen. If I unplug the connector for the first monitor the second one will come on. My connections are (1st monitor) - VGA converted to HDMI and (2nd monitor) - VGA converted to DVI. HELP!
 


So i left it over night and now they are both working again :S any ideas how or why this happened so i can fix it next time?