is there any phrase in arabic for "to go blank / my mind went blank" in arabic ??
THIS MEANS - if you are asked a question and your mind goes blank, you cannot think of anything to say.

for example

" I was so nervous during the interview that when I was asked about my experience, my mind went blank"

Question

is there any phrase in arabic for "to go blank / my mind went blank"  in arabic ??
THIS MEANS - if you are asked a question and your mind goes blank, you cannot think of anything to say.

for example

" I was so nervous during the interview that when I was asked about my experience, my mind went blank"

Answer

ذهني فارغ او عقلي فارغ او 
في العامية :عقلي فاضي

Answer

صار ذهني فارغا (grammatically more correct)

Answer

صار ذهني فارغ (My mind went blank)....(I am learning Arabic.This is what I think would be the translation. Let's wait for the real ones)

Answer

mmmmm.......
I can't think of a special expression for this. but you shall say 
"تاه عقلي " = My mind got lost

كنت متوترا جدا أثناء المقابلة وعندما سُئلت عن تجربتي ، تاه عقلي.

We Egyptian may express it as "مخي اتقفل "

Wish that helps :)