My name is ***** ***** certified professional with over 10 years experience. I will be glad to assist you with this.
I am sorry to hear that you are having this issue.
Follow these steps please>
1. Power Off the PS3 via the power switch in back and power back on w/switch.
2. Hold Power Button on the Front until you hear 3 beeps.
3. Then go through the initial setup and try the wifi again.
Let me know if this does not work and we can try another solution.
okay, this sounds like the old network information is still in the system. The next option will be a system restore>Go to >Settings > System Settings > Restore PS3™ System you can choose quick format for a faster restore.
yes, you will need to do a back up to memory stick if you do not want to lose anything.
yes, just let me know when you are ready.
did that get your wifi going on the ps3?
Let me know if you need more help please.