I bought a new screen and now windows wont load icons,

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Hello,

Today i bought a new samsung screen 27". the other screen was a 800x600 screen. I installed my samsung screen but when i start up my pc it loads and start but when it gets to the actual wallpaper, no icons show, or task bar or mouse], when i try to Ctrl+ALT+DLT the screen just goes black until i hit enter, sometimes i can hear skype start up but nothing is on the screen except the wallpaper.