First issue: never ever plug in or unplug steppers while it is on! this will kill the driver 95% of the time.
Second problem: You haven’t actually said what your problem is... Slow E im guessing
The reason your E is running so slow is you have changed the extruder speed in pronterface to 5mm/minute (the box next to the the length you want to extrude)
This should be more like 250. So it is literally taking 1 minute to move 5mm.
The screen clearly shows this at 1:06 seconds.
But this only effects manual extrudes. But definitely change it for testing.
Also one IO port on the mega dying is very common. but if it moves. it not that
Edited 2 time(s). Last edit at 06/17/2014 03:30AM by Dust.