Ensure that your graphics card drivers are installed and that the resolution is set to match the display.
To determine which graphics card is installed, open the control panel, and system, under hardware, click on display adapters and note which model adapter is installed;
There are some graphics adapters listed as OPTIONS, on the dell support site as well as an integrated intel graphics card. The driver that should be installed depends on which card/adapter is physically installed. If it is factory, and only has the integrated graphics adapter, then it should be the "Intel Graphics Media Accelorator 950"
What is actually installed depends on how your system is configured from the factory, prior to shipping, or if it has been upgraded, you need to know which card it was upgraded/configured with etc..
Here's a list of the possible graphics cards that your laptop could have been configured with originally, the list is located at dell.com, support, product model: e1705, specifications.
NVIDIA GeForce Go 7800 "Addon"
NVIDIA GeForce Go 7900 GS "Addon"
ATI Mobility™ Radeon® X1400 HyperMemory "Addon"
Intel Graphics Media Accelerator 950 "integrated into the motherboard"
The physical display screen is listed as having the following features
Originally Posted by dell.com
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