problems with hp lan printer

i have a network printer HP laser Jet 5M and i have installed and configured it well

but since today it is not working

i have a router with dhcp, printer has its own static ip 192.168.1.6 (set on printer manually) and others computers inside network have static DHCP - on others computers pinging is OK and they can see the printer, but this laptop - not

it has wifi

and has ip 192.168.1.12

here is what i get by pinging the printer:
zbyszek@zbyszek-laptop:~$ ping 192.168.1.6
PING 192.168.1.6 (192.168.1.6) 56(84) bytes of data.
From 192.168.1.12 icmp_seq=1 Destination Host Unreachable
From 192.168.1.12 icmp_seq=2 Destination Host Unreachable
From 192.168.1.12 icmp_seq=3 Destination Host Unreachable

it worked before very good so really i don't know what is wrong

please help