these are steps then you might have done already but i want you to do it again, unplug your router for 10secs, then plug it back, then disconnect your wifi from your ps3 and then reconnect after it shows the same ip addres 192.168.x.xxx open cmd on your pc and ping the IP and then see if ti replies.
Something interesting happened:
I tried to ping the PS3 (192.168.178.33) but on CMD it appeared 192.168.178.37
and it said "host not reachable"
now i am more confused, but i hope i could help you anyhow