Conditional Format Entire Row Based On One Cell In Row

Still selecting the 5 columns you can use

=COUNTIF($A:$A,$A1)>1

If you want both conditions to apply in the same row then you'll need to use 3 conditions

condition 1
=($E1=12345)*(COUNTIF($A:$A,$A1)>1)

condition 2
=COUNTIF($A:$A,$A1)>1

condition 3
=$E1=12345

Note: referring to just $E1 works because the formula automatically adjusts for each cell, in row 1 all 5 columns remain =$E1=12345 [ because the $ prevents any change] but in row 2 this will become $E2=12345

Dear daddylonglegs, thank you for very helpful answers. Could you please add another example of using "Conditional Format Entire Row Based On One Cell In Row" when the criteria is that Cell contains a "string"

Thanks a lot in advance.