This makes me think that there are problems with your VGA drivers. I
tried to locate win7 drivers for your laptop but there are not available
from Sony. Your vga model is nvidia geforce go 7400. Here is the
official link to choose and download the drivers from nvidia's website. In case this doesn't work, try the following
procedure:
1) Download the latest desktop driver for Windows 7 and the card that is
closest to yours from NVIDIA's website.
2) Extract the installer to C:\NVIDIA - Close installer after
extraction. It is not needed now any longer.
3) Find NV_DISP.inf and open it in notepad.
4) Look at the models of cards listed. Choose to edit one that is
closest to yours.
5) Open device manager. Right click on standard vga or your video card
and choose properties. Details tab. Change drop down to hardware ids.
The second line down is of interest here.
6) In the .inf, scroll to the bottom [Strings] section. Again, look for
most similar desktop model. Change the beginning part to match what you
found in last step 5. For example:
NVIDIA_DEV.0421.01 = "NVIDIA GeForce 8500 GT"
and you have 8400M GT, change it to
NVIDIA_DEV.042
6.01 = "NVIDIA GeForce
8400M GT"
7) Now look up higher in the .inf and search for the number you edited.
In this case, "0421" will lead you to this line:
%NVIDIA_DEV.0421.01% = Section010, PCI\VEN_10DE&DEV_0421
8) In this line, edit like this and add your particular string from step
5:
%NVIDIA_DEV.042
6.01% = Section010,
PCI\VEN_10DE&DEV_042
6&SUBSYS_9016104D
Note the changes made between step 7 and this in
bold,underline,italic. Do similar for
your particular hardware string.
9) Save the .inf (ctrl+s)
10) Right click on standard vga in device manager. Click update driver
software. Browse my computer. Let me pick from a list. Have disk.
Browse. Find the .inf you just edited and double click on it. Hit ok so
it installs.
11) Reboot and rerun the .exe from step 1 until completion, to install
the NVIDIA control panel.
In case you have Intel accelarator too, leave the Intel device alone.
In case of a problem or clarification, don't hesitate to post.
Thanks and regards
Please kindly rate this solution
Stelios
direct FixYa link: http://www.fixya.com/users/technical114
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