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If it's a graphical popup, post a screenshot, it's better than any abstract description.
Also, please, test if this happens with a newly created user. That is vital to see if whatever he changed is an user-setting or a system-wide one. That will help us limit the scope from where it could be coming.
he only had access to my user not root. It pops up before the log in screen on boot
Strange, because your user shouldn't have that kind of access. More than probably he used sudo su to gain root privileges or sudo alone to do whatever he was doing.
If it happens before you login, it's not local to your user (unless your distro is doing something really funny). It's not quite clear to me where exactly are you seeing it. It could be the login screen or it could be something in the framebuffer splashscreen while the kernel or init are still booting.