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HP Recommended
Elitebook 8560w
Microsoft Windows 10 (64-bit)

I have hp Elitebook 8560w and was working totally fine until i open it to replace thermal paste for cpu and gpu and on reassembly it doesn't boot up. Showing black screen with flashing caps lock and orange wifi light. The fan still runs whenever i press the power button for booting it up. 

I have double checked  all the cables and connections and they're good.. kindly help 

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