Quote: Originally Posted by 255
Cannot. The other input is DVI and I don't have such cable. Do you think that the cause could be the VGA connection? Weird.
You can buy a DVI-to-VGA adapter, and then try that.
I believe that as was suggested that your previous situation has left indications in Windows that you actually have (or had) two monitors. And I fear that even if you switch your single-monitor situation over to the other port (with a DVI-to-VGA adapter) Windows will simply swap what it considers monitor #1 in a 2-monitor situation. I'm not sure you're going to be able to fix this "phantom second monitor" symptom at this point.
I had a similar situation just this week, as I'm still recovering from my own upgrade to an HD5770 (dual-DVI) card from an HD4850 (DVI and VGA). I actually swapped two machines, keeping the CPU and motherboard in each machine and reversing the internal peripheral cards and non-C hard drives. The HD4850 remained in the machine that had originally been a dual-monitor Windows 7, but with the machine reversal it now was in a one-monitor Windows 7 configuration. And the other one-monitor machine that got swapped... it had its HD4670 (supporting a single VGA monitor) removed and replaced by the dual-DVI HD5770 for my two LCD monitors, and was no longer a one-monitor Windows 7 setup but rather was now a dual-monitor Windows 7.
Well the problem was that I'd forgotten to "move all of the windows over from monitor #2 to monitor #1" on the HD4850 machine before I swapped it into its one-monitor configuration. Well now, even though Windows definitely knew I only had one physical monitor connected and for example automatically moved the taskbar over from monitor #2 to monitor #1, any time I would open a program or dialog window (e.g. OPEN or SAVE AS...) which had previously opened on monitor #2, well it was now "off-screen" in the one-monitor setup. And there is no way to get it back onto monitor #1 with keyboard shortcuts, that I know of.
I ended up having to take this now one-monitor HD4850 machine back upstairs and temporarily re-connect it to the two monitors up there, and reconfigure the HD4850 to once again temporarily be dual-monitor. I then had to open every single program to see where that window went, and if it was on monitor #2 I dragged it over to monitor #1. Same with all OPEN and SAVE AS dialogs, Notepad, Firefox, Office programs, etc., etc..
Only once all windows had been brought over to monitor #1 could I now use CCC to disable monitor #2, disconnect the machine, bring it downstairs and reconnect it back to the one-monitor setup, and now everything opened just fine.
Again... the problem is because of the residual information all over the place regarding your former setup. If you don't mind reinstalling Windows from scratch with the new hardware setup (including new video card), you will now no longer have any problems. But replacing a video card (or going from a dual-monitor setup down to a one-monitor setup) is not easy or painless.