Hi RachaelWD,
·
Do you receive any error message or error code?
Follow the suggestions listed below for a possible fix:
Method 1: I would suggest you to perform clean boot and check if any third party applications are causing the issue.
Place the computer in a clean boot state and then check if it helps. You can start Windows by using a minimal set of drivers and startup programs. This kind of startup is known
as a "clean boot." A clean boot helps eliminate software conflicts.
How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7
http://support.microsoft.com/kb/929135
Note: After troubleshooting, make sure to set the computer to start as usual as mentioned in
Step 7 from the KB article mentioned above.
Method 2: There might be an issue with the drivers related to the display adapter on the computer; I suggest that you update the drivers and check.
a.
Click on Start.
b.
Type in Device manager in the Start Search.
c.
Expand the Display Adapters in the Device Manager window.
d.
Right click
on the device.
e.
Click Properties.
f.
Click on Driver tab.
g.
Click on Update drivers.
h.
Click OK.
Now restart the computer and check.
Refer the link to update the drivers from Windows Update:
Update a driver for hardware that isn't working properly
http://windows.microsoft.com/en-US/windows7/Update-a-driver-for-hardware-that-isnt-working-properly
You may also follow the steps in the article for more help:
Guided Help: Troubleshoot Aero problems in Windows 7
http://support.microsoft.com/kb/976170
Let me know if this worked.