no power no recovery mode no download mode

Hello there guys,
I was trying to install a custom ROM on my COPY of the Samsung Galaxy Mega when I accidentally wiped the /system! Thus I have no OS now and I don't really know why but also no CWM. And since it's a copy there is no Download mode sadly.
I am pretty sure that it's almost impossible to fix this without getting a new hard drive/motherboard but any help would be extremely appreciated!
PS: My phone does turn on, gives only a black screen... it is also recognised as Disk D and Disk F on my computer though.