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When you turn it on do you get a POST or a Startup screen at all? If so do you know how to enter the BIOS and check if it has a graphics card or on-board GFX? If it's on-board you will have to get it checked by a pro as it could be the chipset or the GFX chip that has failed. The system boards are not cheap even to buy on eBay so it might not be economically viable to fix. If you're confident enough the only thing you can do is a trouble shooting session. First ground yourself by touching a radiator pipe or something that is earthed and without wrenching take out the RAM(push out the spring clips), clean the connector strips and blow out the slots. Replace and try to boot(its amazing how RAM can play havock with a system). If you have no joy with that you will need to take the video card out(if it has one) and do the same with that, be careful though, some GFX cards use the CPU heatsink as the cooling device and you will need new TIM(thermal interface material) for both. If still no joy take out the GFX card and revert to on-board graphics through the Bios if possible(most don't have on-board GFX). If you still can't get it to work then then that's about all you can do yourself without help or spending money. You either need a friend that doesn't mind messing with his laptop so you can try your card in it or take it to a repair shop for testing.
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