A2 is related to detecting any HDDs or SSDs on the PC.
The "error codes" are actually POST codes that indicate what particular POST process is being run. If a POST process fails, POST stops and the number of the process that failed remains displayed.
It sounds like moving the PC caused something internally to be moved out of position. You need to open the PC and check everything, particularly the connections to the drives, both data and power, and the SATA data cable connections to the board.