[kinderpingui20]

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ExtCtrls, StdCtrls;

type
  TForm1 = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Button1: TButton;
    Timer1: TTimer;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
var
i:integer;
begin
i:=0;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
Timer1.Interval:=1000;
Timer1.Enabled := True;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
var
i:integer;
begin
if i > 4 then i := 0;
 case i 
 of 1: label1.Caption:='1000';
     2: label2.Caption:='1000';
     3: label3.Caption:='1000';
     4: label4.Caption:='1000';
 end;
 Timer1.Enabled := False;

end;

end.

запускается но не пашет=(вроде всё сделал как Вы написали