HP laptop adapters are cheap these days.
http://adapterkiosk.nl/?id=originele-hp-compaq-90w-18-5v-4-9a-center-pin-7-4-x-5-0-mm-ihkikbkiuihi
http://adapterkiosk.nl/?id=originele-hp-compaq-18-5v-3-5a-65w-center-pin-7-4-x-5-0-mm-ihkikbkiuurm
These original adapters should work on that laptop. I...