The orange light means that the laptop is charging.
If your laptop will not turn on, your power adapter might not be strong enough to run the laptop AND charge the battery. Let the machine charge to full battery and then try powering on the laptop.
If you have charged the battery (or the battery never charges to full power) and it won’t power on, you might have a bad battery. It could also be something else, such as a failure of another component on the motherboard. I would definitely check with HP Support, especially if this laptop is newer than a year or two.
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