How to "do this" when failed hack attempt

[IKoxaI]

So im trying to figure out  what is the best (if there any) way to make script "do this" ( playsound for example)  when player failed hack attempt . The idea i come up with is  to check if there the specific sctring on the screen (<string> &-sHackingLockout3 for example) , but im noob at scripting and dont know how to write it . Any idea?