The canned air might cause some white stubstance in your ps3... You Might not want to go that route but if you have compressed air you can go that route. Hey Whalers... just thought of this one... if you're hardlineing it to the router/modem/network/etc. it could also be that You Might have a bad wire.
it was a brand new wire when i bought it and i have it running where nothing touches it except for @ the router and @ the PS3 & X360.
but would a bad wire not work 3 times then work the 4th time without touching it or anything? i think the wire is ok.
i think i need to clear up the cache then see what happens from there.
i will keep you posted.