I recently swapped my computer to a new case which didnt work so had to put it all back in the old one, now i labelled all the wires and connections so i knew where everything went. BUT when i switch the computer on it goes into the black screen that tells you what connected and weather evrything is in order and it is telling me that it cant boot up and that we need to put the system bootup disk in! what is this can anyone help?