Keyboard and Monitor no Signal

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Please help me solve my PC issue. After cleaning the CPU and removed the CMOS battery, my PC's monitor will prompt "No Signal" and the keyboard has no response. What should I do?

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Is this a laptop ?

Did the problem occur before or after the cleaning ?

How did you clean it and why?
Thanks for your response. This is a desktop computer and the problem occur after cleaning. I've cleaned the CPU due to dust and webs that is residing inside the CPU. I haven't removed any sockets except for the CMOS battery because it is also prompting that the battery is low which can't keep the time of the computer. What should I fix this? Thanks.
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How did you clean it ?

Did the problem occur before or after the cleaning ?