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Why does my computer turn on but show a black screen?
My computer powers on with fans spinning and lights glowing, but the monitor stays completely black with no BIOS splash screen or any display at all. I've tried reseating the RAM, checking all cable ...
Test video output from the motherboard instead of the GPU.
If you have a dedicated graphics card, plug the monitor into the motherboard's video output instead (near the CPU I/O ports) rather than the GPU.
If you get a display this way, your GPU is the problem.