Okay, I have everything installed and i followed the instructions, but when i click Maplestory, it says "This page cannot be displayed". And when I click play, my screen goes black and then comes back, but nothing happens.... Help?
When you end any MS process, it's normal for the screen to go black, so don't worry.
Answer to your question: yes it probably is because your brother is playing. You can't log onto MS with the same IP address at the same time, and using a wireless connection means everyone connected to it has the same IP address. Try getting your brother to stop playing and try again... If it fails: Are you sure you're connected to the internet? Is your firewall blocking/denying/not allowing Maplestory.exe?
He was offline the last time i tried and it worked fine.. but he was still able to log in too... i know, we played together.. we even do it on regular maple sometimes