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I have a Windows 7 PC with TeamViewer installed on it. This computer is always on and has no screen, keyboard and mouse attached to it, only an internet-cable.

I login from my Mac on TeamViewer, create a connection to my Windows 7 PC and the result is an 640x480 screen. The problem is that my Windows 7 PC does not detect any display.

If I check display settings in Win 7 then this happens: enter image description here

I can't select another resolution. How can I choose another resolution?

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Did you install the correct graphics drivers? –  ChrisN Jan 10 '13 at 0:04
Default drivers of my graphic card are installed. I didn't install any other one. Do I have to? This is my view of Win7 in Teamviewer right now: cl.ly/image/01160D31472I –  Pieter Jan 10 '13 at 0:55
Can you force the resolution using your graphics card drivers? In my nVidia Control Center, I can go to Display-->Change resolution, click on Customize, and click Create Custom Resolution... I don't know if that would work because you don't have any physical displays attached. Your best bet would probably to use Remote desktop - it isn't affected by display size on the remote computer - it uses your local display size. –  ChrisN Jan 10 '13 at 1:28
Hi Chris, thanks for your reply. I did try an custom resolution setting but indeed it do not work without a display. So I installed Remote Desktop and now it works fine! –  Pieter Jan 11 '13 at 12:10
Same problem with two Windows 7 machines with latest nvidia drivers (2560*1440 host and 1920*1080 remote). But via Teamviewer the remote machine has only Analog display with 640*480 resol –  user187423 Jan 12 '13 at 11:22
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1 Answer

@ChrisN comment is the right answer. I'll post it as an answer to the readers:

In my nVidia Control Center, I can go to Display-->Change resolution, click on Customize, and click Create Custom Resolution: Creating custom resolution

After that, select the checkbox that adds it to the list of resolutions and select in on the main "Change resolution" screen.

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