My computer turns on but does not show up

I have a Compaq computer and I'm trying to get it to work but nothing shows up, I just upgraded the CPU and GPU all at once and nothing works. I need help

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Start over.

That's the first step. Now try one upgrade at a time. Many models only supported certain GPU and CPUs so you have to start over.

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Tell model number

Of this compaq.

Tell the cpu that you installed.

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