If you check the specs, you might find you have another power adapter somewhere that can take it's place at least as an experiment.
If you crack open the power supply, you might find blown capacitors in it. Replacing those will sometimes be enough to fix it, but other times they can cause collateral damage when they fail.
Most of the power adapters on eBay are generic, cheaply made Chinese imitations. I've had problems with them on other devices, and cheap power supplies in general are notoriously problematic. They sometimes have clever wording like "For HP" on them - not an actual HP endorsed product, just "For" it.
Try to find someone selling a genuine part if you can. It takes some digging but there's usually a few available. Searching on the original HP part number can help, but you still have to look closely at what they're selling. Make sure it's tested and guaranteed working though. A genuine part is usually not new, while the cheap imitations always will be.
I'm all in favor of laser printers but I wouldn't give up on what you have if you're happy with it and it turns out to just need a power adapter.
If you do buy new, I'd run away from inkjets, but I have a personal hatred for them that borders on irrational. If you get a laser, make sure it has a fan. Laser printers require heat in order to work, so those that lack a fan are making a cheap attempt to defy physics.