- Go to HP's support website, enter your machine serial and find the downloads page. Download and run/install the latest system BIOS for your specific laptop. There will be instructions. Follow them to the letter.
- HP's have onboard diagnostics. Not entirely sure which key brings up the boot menu (ESC I think?) but the option should be in there. Run it and make sure the hardware is still good.
- Got any canned air? Hold your breath and blow out the fan thoroughly from both directions.
- 8GB of system RAM is plenty for your uses so forget about upgrading it and save your money.
- Look to see how much space is being taken up on that 1TB drive it came with. It's possible if not probable that you're not using anywhere near that much. Unless you're a movie/picture/game hoarder, 500GB is usually plenty. This gives you cheaper options.
- Back up all your stuff. Ask around if you need help.
- Is it running Windows 10? Great. If not...
- Is it running Windows 7/8/8.1? Find the license key sticker. It may be under the battery if it's removable. Take a good clear pic of it.
- Either way, find out what flavor of Windows it's running. 32bit (doubtful) vs 64bit. Home vs Pro.
- Replace that old 2.5" spinning hard drive with a 2.5" SSD in the size of your choice. $50-$65 for a good 500GB model, $100 or thereabouts for a 1TB. Easy but beyond the scope of this.
- Reinstall Windows 10 in the correct flavor using this tool and instructions HERE . Activate 10 with the 7/8/8.1 license key if necessary. Easy but also beyond the scope of this.
- Enjoy getting a few more years out of that laptop with minimal time and money invested. You may even enjoy the process and learn a thing or two.