still having problem??
"It won't let me select the internal sd but it lets me select everything else."
If you are unlocked or S-0ff and still having this issue, I would suggest installing Amon-Ra recovery
Start recovery, choose USB-MS toggle, connect to Windows machine,
choose toggle internal SD, then format it. could do the external storage to format as well.
Now both should be visible and ready to take your ROM flash or nandroid restore.