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How long is the mfg warranty?
Sorry, there was a problem. Please try again later.It should be the F5 or F4 key. It might be necessary to press the fn (function) key at the same time. This link is to a HP help article that talks about the backlight feature https://support.hp.com/us-en/document/c01612362#:~:text=If%20your%20notebook%20computer%20has,the%20row%20of%20function%20keys.
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