THe problem is the following:
I'm trying to install a HP DeskJet 930c on my Gentoo linux. I've downloaded and installed HPlip package

Then I made all steps according to on-site manual
cupsd and hplib started succesful, but when I try to add my printer on the final stage (after choosing the printer model) nothing happens - web page just freezes up

What should I do?

Are there any errors in:

/var/log/cups/error_log

or

/var/log/messages

?

Is this a network printer? I had the same thing happend with an HP Deskjet 5200D. Check out www.linuxprinting.org and see if there are any special instructions for your model. I solved this problem by using Kprinter instead of CUPS setup -- it properly set the protocol stuff for the network. This was the recommendation of Linuxprinting.org. Check to see if gnome has something similar...
Joel

Nope, this is local printer(connected to USB)

/var/log/cups/error_log
I [25/Jan/2007:20:12:10 +0000] Listening to 7f000001:631
I [25/Jan/2007:20:12:10 +0000] Loaded configuration file "/etc/cups/cupsd.conf"
I [25/Jan/2007:20:12:10 +0000] Configured for up to 100 clients.
I [25/Jan/2007:20:12:10 +0000] Allowing up to 100 client connections per host.
I [25/Jan/2007:20:12:10 +0000] Full reload is required.
I [25/Jan/2007:20:12:11 +0000] LoadPPDs: Read "/etc/cups/ppds.dat", 777 PPDs...
I [25/Jan/2007:20:12:11 +0000] LoadPPDs: No new or changed PPDs...
I [25/Jan/2007:20:12:11 +0000] Full reload complete.
I [25/Jan/2007:20:12:42 +0000] Started "/usr/lib/cups/cgi-bin/printers.cgi" (pid=6378)
I [25/Jan/2007:20:12:58 +0000] Started "/usr/lib/cups/cgi-bin/admin.cgi" (pid=6387)
I [25/Jan/2007:20:15:39 +0000] Started "/usr/lib/cups/cgi-bin/admin.cgi" (pid=6456)
I [25/Jan/2007:20:15:50 +0000] Started "/usr/lib/cups/cgi-bin/admin.cgi" (pid=6457)
I [25/Jan/2007:20:15:52 +0000] Started "/usr/lib/cups/cgi-bin/admin.cgi" (pid=6458)
I [25/Jan/2007:20:16:01 +0000] Started "/usr/lib/cups/cgi-bin/admin.cgi" (pid=6467)
I [26/Jan/2007:01:36:20 +0000] Scheduler shutting down normally.

/var/log/messages

Jan 25 20:12:11 glitch hp: unable to open /var/run/hpiod.port: No such file or directory: api/hplip_api.c 93
Jan 25 20:12:19 glitch hpiod: 1.6.12 accepting connections at 2208...