Ahhh... I had to do a bit of research to find out the rest of the story. It looks like HP is not supporting older scanners on newer operating systems - not just macs but Vista too.
I don't know what to tell you. I did find this link that discusses the problem for a variety of older scanners...
Your HP is not mentioned, but perhaps some workaround for these scanners will work with yours.
The conclusion I found on several sites is to buy a new scanner or buy the available drivers if they will do the job. I'm not sure how old your HP 5510 is - it looks like HP's strategy is to just make their customers upgrade the equipment.
If you find a solution, please come back and post it.
Hi i'm using an intel mac, running leopard
i have a hp officejet 5510 all in one scanner-printer-fax
i am able to print on it but am having difficulty with the scanner
using vuescan seemed to work
but the demo version had this watermark thing
is there a freeware alternative to vuescan that i can use?