Put in the motherboard and didn't know that you had to used Screw C or Screw D to secure the mobo to the case.
I used screw A which is for securing the 5.25 device.
I tried removing it - but its not coming out.
well there should be no negative side effects. but well since you can't budge it you can keep it that way but it's better to get it removed as it might obstruct some balance or something on the mobo placement