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no display on start-up

I have just replaced the keyboard, hard disk and memory on my laptop. However when I try to reboot I get a blank screen, I have pulled it down again to check all connections were ok, but same response - any suggestions.

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Hook up to an external monitor to see if the GPU is OK. Why did you replace the parts you did and was the screen working before you did so?

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Hi everybody.

Same problem on my Macbook Pro and i do not have a screen on the external monitor also :(

Mainboard or GPU broken?

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