No, the iMac will not play a Blueray disc.
No. You can only play games made for Mac OS on an iMac.
There is no Mac version of Maple Story but if you have a recent iMac with an Intel processor than you can run Windows on your iMac and play the Windows version of Maple Story - see related link below for details.
Im thinking of buying a imac g5 but I don't know if I can run Minecraft on it
No it will not play a 6" disc. It will play a CD or DVD.
Yes
Only if you have a Mac version of this game or you have the Windows version and you have Windows installed on your Intel iMac.
It depends on your operating system.
I own an iMac and don't have that error. This should no happen and you should look into memory allocation before you next start it up.
yeah! you can connect your gaming control
There hasn't been an official trailer yet
Not without a blue-ray player which you can purchase.