Try connecting an external monitor when it happens to see if you see the same thing on the external monitor (press Fn+F8 so you can get image on the monitor) if that doesnt work try updating the video drivers on the system, if still no go run the Dell diags on the system, if the diags on the system pass it could be a software error when your running the diags on the system and an error comes up write it down so when you call tech support they will know what to do, but try the options that i gave you before you give them a call most likly they will have you do these steps.

 

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Latitude D810 2.0 PM Xp Pro 1 Gig DVDRW
Inspiron 6000 1.5 CM XP Pro 512 mb 40GB DVDRW drive
Inspiron 300m 1.2 P4 Win 2000 256mb 30 GB CDRW drive

Does it happen when your running a specific application & how often does it happen

hey there, I noticed mostly when I use MSN messenger...I asked dell and that what they told me to do...

 

If no error were found the next step is to reinstall the operating system. To do
this perform the following steps:

To perform a restore of the operating using PC Restore, perform the following
steps:
Note: before performing this procedure disconnect all peripherals from the
system. Connect only the keyboard, mouse and monitor. Also back up all your
information because ***everything  will be erased***.

I don't know what to do anymore...?