Did your "professional installers" clean/rebuild the pump?
If the motor runs and nothing at all happens, it may be a plugged inlet screen.
Did you try angling in both directions? If the blade is angled all the way to one side (most likely to the LEFT), it could be that the valves are stuck directing fluid in that specific direction. Check that you are getting power to your "B" solenoid when you are trying to lift the blade, and power to the "C" solenoid when you are trying to angle in one direction but not the other.
No valves energized + motor: angle left
B valve energized + motor: lift
C valve energized + motor: angle right
A valve energized: lower
There is NO time when the B and C valves are energized simultaneously, nor B and A valves.
Left and right could be reversed in some conditions.
A+C+motor can be powered simultaneously, also A+motor. This is for power angling while in float (lower).
E58H service manual: http://ww2.meyerproducts.com/upload/...p%20Manual.pdf
Oh, also make sure that your fluid is full when the lift cylinder is in the DOWN position. If your installer didn't top up the fluid after bleeding the angle cylinders, you could simply be empty.