Can i get online with a ps3 with a Ethernet cable connecting my optimum modem and ps3?

May be...

thanx for askin dis



=)

you might have to call your internet provider and have them reset the modem or something. Just call them and tell them what you are doing.

Or call sony

1-800-345-7669

yes i have wireless now but jus connect it to ur modem thn to the back of ur ps3 and go to settings...network settings....wired.....and keep filling out

Yes. But you might want to get a Router, so you can connect your computer as well.