it might sound silly, but are you sure your HDD is ok? I find the quantum's that where supplied with a lot of the LC series have a habit of dieing at the worst times.

Also have you checked your PSU voltages? if their out you might find that your hdd doesn't spin up (at least this was the case with my LCII, the psu was out of spec enough to stop the hdd spinning up, but the rest of the system worked fine)

Also you should post some pics of your work