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Could be any of these - Faulty graphics card, faulty hard drive, bad RAM , bad PSU, less likely faulty motherboard. Test the hard drive for errors, Remove all but one stick of RAM, If your system has onboard graphics, remove the card and try to boot without the card. If you haven’t got onboard graphics I would take it to a tech for them to figure which part is faulty. The only way is to replace with known good working parts |
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