|"Unfortunately its stuck at the lowest resolution"|
That's because you haven't installed the video driver. And if you haven't installed that driver, I suspect that you haven't installed the other drivers either (chipset, sound, network, etc).
Dell has the drivers available at their website but apparently several different video cards were used with your model....ATI Radeon, Intel integrated or nVidia Geforce. It's impossible for any of us to know which you have. You should have noted what you had before you formatted.