Z4 Power Stearing

i have a kinda screeching noise on my z4 2.0 when i turn the stearing from a stationary position.
I found out the z4's have an electonic power stearing so not sure what is the cause.

also have a weird noise when i turn on ignition, and you cannot start off the turn, have to wait 5 seconds then start.

could the electronics be an issue