For this laptop, I cannot find an adapter from HP on their website, so the OEM adapter may be “EOL” at this point. For this model, you may need to settle on a used OEM adapter. The HP Spare# is 239705-001.

I’m not going to make any recommendations on where to buy it, but what I would do is take the Spare# and check sites like eBay for it specifically. You may need to supply your own power cord, but the brick shouldn’t be that expensive. They tend to go for $10-20 on eBay, new or used. The reason they’re so cheap is because of the amount of dead nVidia units vs. working power adapters - the adapters outlive the bad GPU here. What that means for someone with a good GMA unit like yours (which didn't break so bad it ends the machine's life) is you can get cheap adapters that are known to work whereas the notebook died, and for cheap :-). They’re just trying to sell off the adapter, so you can get a cheap replacement without looking too far.

But just make sure you don’t spend a lot on this laptop - it’s a factory Vista system from 2007. It probably only still works because it’s not one of the nVidia units, which are all dead, or one heavy load on the GPU from it.