Hi
I use a Lexmark Z602 USB printer whitout any problems; and i didn't modify my /etc/fstab in any way.
1. I don't know if a scanner needs it, but a printer doesn't need a modified fstab.
2. In order to use the driver provided by HP, you need to have your USB devices recognized.
Try to activate hotplug (that should work). You also need USB support in your kernel, either moduled or built-in. After that, configure your CUPS or LPRng.
-To check is your USB system is up:
user@xxx:~$ lsusb
-to check which modules are loaded:
user@xxx~$ lsmod
If you use KDE, once you have checked that USB is working in your machine and recognizes your printer, just type
user@xxx~$ kaddprinterwizard
It worked for me.
Good luck!