can I buy new keyboard online through your website.
it is not under warranty period
Yes, but you need to supply the right part number. Page 32 and 57 of the following manual shows you a list of parts for keyboards depending on your preferred language
(a) You can use part number to order from HP Store in your country,
(b) Or from other online sources such as Amazon, eBay ...
The above manual also shows you how to replace keyboard yourself from page 57.
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