hi nielshs,
how could you format the internal memory???
Using a PC(which OS?) and the USB connection,right?
mmm...I don't think it is a recommendable oparation...
...by the way, you can try to format it again, maybe disabling the quick format option (or viceversa)...or some other formatting tool instead of the one included with the OS
Keep us updated...

Regards,
Rival
PS..which software release do you have on G70?