Keep it natural and serve best value for your audience.
If you only repair HP computers, then this should be made pretty obvious when visitors land on your website. Page titles should contain this so users of search engines are aware of this prior to clicking through to your website. There oughtn't be a need for this message to be replicated through page's headers.
Contrary to the other answer, meta description bears no reflection on search engine rankings and ought to be used to sell that page in the event a search engine displays your defined meta description in the search results for your site's listings. The meta keywords isn't even worth worrying about, there isn't anything of any significance or value that uses this tag any more.
Keeping your header tags to simple and clear descriptions of what that page is about such as 'Motherboard repairs' and 'Keyboard repairs' is natural, visitors will understand this and search engines will understand it. It is relevant providing that section contains content relating to the header. Only use one
h1 tag on the page and you can also use sub sections of
h3 where necessary to break the page architecture down further still.
The header tags on their own don't hold a particularly great amount of weight for page performance in organic search so be sure to serve great content along with well structured and relevant headings, sub headings, imagery and page titles.