I haven't looked at CM recently, so I don't know if there are any issues with the build you used.. or if the install simply had problems on your phone. But if you can't access recovery.. and storage also appears inaccessible you may well have corruption or a serious misconfiguration.
If it isn't clear to you what is amiss, I'd simply try reinstalling the stock ROM again. I might have suggested that you check to see if the phone is configured in the MTP + ADP mode. But having difficulties flashing alludes at deeper issues. So I recommend that you look into mskip's excellent S3 tool kit
and use that to reflash to a stock Roger's ROM image
as a stable baseline. Then you can reinstall CM from there if you wish.
As you said Rogers, I can only assume that you meant an i747m phone when you said i747. So also have a look at this thread
for general information. I doubt it touches upon a CM build, but would be pertinent if you wanted to flash something like an AT&T modem to the i747m.
In my experience the toolkit is able to flash a stock image back even with badly messed up file systems.. pretty much anything short of a brick. As long as the low level bootloader is responsive during boot it should catch.