I read through some forums which suggested unplugging the drives one at a time to isolate the problem, I did find that one of the hard drive cannot be plugged in or it would not boot up at all with it connected and it gives me an error 0x0000007B. I have since been able to get my computer to actually boot up, with the A2 still appearing during the boot process. It is now giving me a completely black screen with a white cursor top left and white 'A2' in the bottom right which I have read to understand as a drive/motherboard issue. It started saying my disk was degraded - that seems to be okay now, both of my Seagate drives (ST2000DM001) are now green showing Non-RAID Disk. It was on a surge protector and it is no longer working either. Last week after a power surge the computer would not turn on at all. I cannot upgrade my OS or I cannot run the program to develop the radiographs.

I am running an old ASUS PC with Windows 7 for the specific reason as it's the only OS that supports my x-ray developer.

Free for mac instal FreeFileSync 13.2