It sounds like either the motherboard has token some damage or your graphics card has.
If it is your motherboard, which can be either the board itself or the graphics chipset built into the motherboard, then your only option would be to replace the motherboard.
If that dell came with a seperate graphics card, then youn will have to replace the graphics card.
There is also the possibility that you have both the built in and seperate graphics card, and someone put the vga or dmi plug into the wrong slot.
These are the most likely culprits, but it could be something else, like ram having gone bad.
If you decide to go into your computer, make sure to remove the power cord, put on or buy a wrist strap and plug it into a grounded outlet, and push the power a couple of times after removing the plug to draw out all remaining power.
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