Cannot change the screen resolution [Closed]

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I have installed Win 7 on this GX270 and cannot change the screen resolution from 600X800. Tried everything I could find on the net did not work.
Dell Optiplex GX270 and Dell E177FPC screen
Advice Please

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Hello,

Try this 1

You need to install the VGA Drivers. Click on the below hyperlink "Drivers".

Drivers

Follow the onscreen screen instructions --> Download the "Video" drivers

for Windows XP and try to install it in compatibility mode by following the

instructions given in the below link.

https://ccm.net/faq/24611-installing-a-driver-in-compatibility-mode-in-windows-7

Good Luck
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Thanks for the info, busy doing ask u have listed. Will advise later
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Hi Sheferkhan,

With permission I would like to add one more tip here. After manually reinstalling the Microsoft Windows operating system on your Dell desktop, you must also reinstall the Dell device drivers and applications in the correct order for your computer to work properly. Click here to find instructions on installing the drivers in correct order.

To know more about Dell's products, services and drivers & downloads, please go to http://dell.to/YBlak6