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HP Probook 4540s caps lock blinking continously

HP Probook 4540s
Microsoft Windows 10 (64-bit)

My lap is not booting up, black screen and the caps lock is continuously blinking. As per blink code it may be power issue, however I have checked the AC adapter and it is working fine.Luckily it sometimes boot up to bios when pressing esc button but after restarting it backs the same.


I have tried with the below possible solution but no luck.


1. unplugged power and removed battery.

2. reinserted memory module.

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