Dell 545s has black screen

la321

Honorable
Jun 14, 2012
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My moms god son has been using my computer but an ago he called me in and my screen is black Dell black screen - YouTube how can i fix this? i don't have the installation disc because this was a computer that had windows vista when i bought it and a disc came with it to upgrade to windows 7 i can't go into advanced setting by pressing f8 i only can press f2 and f12 i pressed f12 and ran diagnostics a message appeared saying it couldn't find any problems with my system then asked to continue to check memory
 

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