I have a similar problem with an A3000D Mobo and it turns out the CPU is dead. That's not something I can desolder from the board so this board will be depopulated and trashed.
FYI, I have 2 A3000's that suffered the same problem. On the first I simply cut the legs away from the CPU with a very sharp exacto blade. Once the chip was out, it was easy to unsolder the the legs from the motherboard. A couple of years later I used a heatgun to remove the bad CPU from a second 3000D. Of course you have to protect other parts of the motherboard from the heat. Tin foil does a good job. Once the old CPU is out, you plug in an external 030, 040 or 060 card and you're good to go again after setting the jumpers for external CPU.
Plaz
