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After updating the Bios in my Prodesk 400 G5 to 2.23.00, my second monitor connected to my VGA port Went Black. Windows can see the display but it does not display.  This is an Issue that i am sure many will have. After looking at the Update history in the Bios i rolled it back to 2.17 and now the second display connected to the VGA is working. I noticed in Bios 2.18 that there was an enhancement to increase VGA port compatibility. I am not sure if that was the cause or something in a later update. But This issues needs to be resolved. I hope others that have this issue find this post!

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