Windows 7: Windows 7 Ultimate x64 doesn't detect Samsung SyncMaster 2043NWX

Hello everyone,

Recently, I've got a Samsung SyncMaster 2043NWX monitor. It's an used one, but it did work. My computer is an Acer Aspire M3920 (desktop), a more complete configuration can be found in my profile.

My desktop PC connects to my main monitor, an Acer P196HQV via an HDMI to DVI connnector, and my desktop PC connects to my second monitor, the SyncMaster, via VGA.



The problem is, however, the second monitor doesn't work. Windows 7 does detect a monitor connected via VGA in Control Panel > Appearance and Personalisation > Display > Adjust Screen Resolution, it says in the display box:
In the Device Manager it only detected my Acer monitor, but after I downloaded the SyncMaster driver from the official site of Samsung, it detects the SyncMaster instead of the Acer monitor! This isn't the case in Adjust Screen Resolution.

The SyncMaster shows nothing at all, the blue LED, where I can tell the monitor is turned on from, flickers all the time, but the screen doesn't show anything.

I have tried reinstalling the driver, restarting my computer, installing the newest updates for Windows 7, making the SyncMaster my main monitor, turning off the Acer monitor, but nothing works.

I really hope any of you can help me, and thank you very much for the time you've taken to read this problem of mine.

PS
I have connected an extra monitor to my laptop running Windows 7 Ultimate x64 too without any problems, so I am not completely unexperienced.

Nobody has a solution?