2005 suzuki forenza - starting?

I have a feeling that something simple has happenned to my vehicle. Battery has been tamperred with and now won’t start.Any ideas on something that would be easy to undo and redo ?

tampered with? battery have charge? lights work? starter turn over? any noise when turning key? dashboard lights? fuses blown? just a few of the questions to ask and to answer…good luck

What exactly do you mean the “Battery has been tamperred with?”

When you try to start it, exactly what happens? I turn the key and …

Include exactly what you feel and hear.