This is quite a conundrum. Since you've tried all your discs, the chances of it being the discs is very low. But, since you've done it on multiple computers and operating systems, that rules out the computer or system.

I would suggest getting a virtual drive and copying your discs into one of those, but such programs can be annoyingly hard to find. If you can get one, though, use it, as it is treated as an individual drive but is still on your hard disc so it bypasses almost all communication problems.