How to turn of casio fx-911w? I tried to press shift and on/off didnt work. I tried shift and AC also not working. Please help. Thanks

SOURCE: Casio FX-100AU

Just input #20 then press log button then (2/10 shift 5 (m)) so it will look like 20log (2/10m) = 46.02

SOURCE: casio fx-83ES

there is a button SD close to AC button, standard - decimal try it .......or
shift+mode format math IO, change it to the other option

SOURCE: Casio fx-83ES

Press Shift and then In 

SOURCE: casio FX-9750G Plus won't turn on

I had the same problem too. I just bought it and I was trying to turn it on but it wouldn't though the manual said that it was supposed to automatically when the tab was pulled out. Good news: the Reset button on the back works. I pushed it for some time with the end of a toothpick and it worked.

hope it helps.

SOURCE: when i press the MODE button in my CASIO fx - 911ES

Hello,
Just in case : Press [SHIFT][CLR] (9) [3: ALL] to reset the calculator and try [MODE] again.
If that does not work, your calculator may be defective or a fake (not the genuine article). If at all possible, return it to where you bought it and get a refund.

Here is a picture of the FX-115ES, its face looks like the 991ES. Hope I am mistaken.