ปัญหาการออกรายงาน php+fpdf หน้าแรกไม่ออกแต่ไปออกหน้าที่สอง

<?php
require('pdf/fpdf.php');
require('dbconn.php');
// สร้างคลาสชื่อ PDF โดยสืบทอดมาจาก FPDF
class PDF extends FPDF {

    // เพิ่มฟอนต์ภาษาไทยเข้าไป
    function SetThaiFont() {
        $this->AddFont('AngsanaNew','','angsa.php');
        $this->AddFont('AngsanaNew','B','angsab.php');
        $this->AddFont('AngsanaNew','I','angsai.php');
        $this->AddFont('AngsanaNew','IB','angsaz.php');
        $this->AddFont('CordiaNew','','cordia.php');
        $this->AddFont('CordiaNew','B','cordiab.php');
        $this->AddFont('CordiaNew','I','cordiai.php');
        $this->AddFont('CordiaNew','IB','cordiaz.php');
        $this->AddFont('Tahoma','','tahoma.php');
        $this->AddFont('Tahoma','B','tahomab.php');
        $this->AddFont('BrowalliaNew','','browa.php');
        $this->AddFont('BrowalliaNew','B','browab.php');
        $this->AddFont('BrowalliaNew','I','browai.php');
        $this->AddFont('BrowalliaNew','IB','browaz.php');
        $this->AddFont('KoHmu','','kohmu.php');
        $this->AddFont('KoHmu2','','kohmu2.php');
        $this->AddFont('KoHmu3','','kohmu3.php');
        $this->AddFont('MicrosoftSansSerif','','micross.php');
        $this->AddFont('PLE_Cara','','plecara.php');
        $this->AddFont('PLE_Care','','plecare.php');
        $this->AddFont('PLE_Care','B','plecareb.php');
        $this->AddFont('PLE_Joy','','plejoy.php');
        $this->AddFont('PLE_Tom','','pletom.php');
        $this->AddFont('PLE_Tom','B','pletomb.php');
        $this->AddFont('PLE_TomOutline','','pletomo.php');
        $this->AddFont('PLE_TomWide','','pletomw.php');
        $this->AddFont('DilleniaUPC','','dill.php');
        $this->AddFont('DilleniaUPC','B','dillb.php');
        $this->AddFont('DilleniaUPC','I','dilli.php');
        $this->AddFont('DilleniaUPC','IB','dillz.php');
        $this->AddFont('EucrosiaUPC','','eucro.php');
        $this->AddFont('EucrosiaUPC','B','eucrob.php');
        $this->AddFont('EucrosiaUPC','I','eucroi.php');
        $this->AddFont('EucrosiaUPC','IB','eucroz.php');
        $this->AddFont('FreesiaUPC','','free.php');
        $this->AddFont('FreesiaUPC','B','freeb.php');
        $this->AddFont('FreesiaUPC','I','freei.php');
        $this->AddFont('FreesiaUPC','IB','freez.php');
        $this->AddFont('IrisUPC','','iris.php');
        $this->AddFont('IrisUPC','B','irisb.php');
        $this->AddFont('IrisUPC','I','irisi.php');
        $this->AddFont('IrisUPC','IB','irisz.php');
        $this->AddFont('JasmineUPC','','jasm.php');
        $this->AddFont('JasmineUPC','B','jasmb.php');
        $this->AddFont('JasmineUPC','I','jasmi.php');
        $this->AddFont('JasmineUPC','IB','jasmz.php');
        $this->AddFont('KodchiangUPC','','kodc.php');
        $this->AddFont('KodchiangUPC','B','kodc.php');
        $this->AddFont('KodchiangUPC','I','kodci.php');
        $this->AddFont('KodchiangUPC','IB','kodcz.php');
        $this->AddFont('LilyUPC','','lily.php');
        $this->AddFont('LilyUPC','B','lilyb.php');
        $this->AddFont('LilyUPC','I','lilyi.php');
        $this->AddFont('LilyUPC','IB','lilyz.php');
    }

    // หาก encoding ของภาษาไทยเป็น UTF-8 จะต้องเปลี่ยนให้เป็น TIS-620
    function conv($string) {
        return iconv('UTF-8', 'TIS-620', $string);
    }
	function Header()
{
$w=array(50,40,40,40);
$header=array('รหัส Keyboard','ยี่ห้อ','รุ่น','สถานะ');
    for($i=0;$i<count($header);$i++)
		$this->Cell($w[$i],7,iconv('UTF-8','TIS-620',$header[$i]),1,0,'C');
	$this->Ln();
}
	//Better table
	function ImprovedTable($data)
{
	

	foreach ($data as $eachResult) 
	{
		$this->Cell(50,8,$eachResult["key_id"],1);
		$this->Cell(40,8,iconv('UTF-8','TIS-620',$eachResult["key_brand"]),1);
		$this->Cell(40,8,$eachResult["key_model"],1);
		$this->Cell(40,8,$eachResult["key_status"],1);
		//$this->Cell(30,8,$eachResult["mnt_id"],1);
		//$this->Cell(30,8,$eachResult["key_id"],1);
		$this->Ln();
	}
	
}

}
$pdf = new PDF();
$pdf->SetThaiFont();
// ตั้งค่าขอบกระดาษทุกด้าน 20 มิลลิเมตร
$pdf->SetMargins(20, 20);

// เพิ่มหน้าใหม่เข้าไป

$pdf->AddPage();
// กำหนดฟอนต์เป็น AngsanaNew ให้ตัวหนา และมีขนาด 20 pt
$pdf->SetFont('AngsanaNew', 'B', 20);
$txt=$pdf ->conv("รายงานคอมพิวเตอร์ทั้งหมด");
$pdf->Cell(0, 0, $txt, 0, 1, 'C');
$pdf->Ln(10);
$header=array('รหัส Keyboard','ยี่ห้อ','รุ่น','สถานะ');
$strSQL = "SELECT * FROM keyboard order by key_id ASC";
$objQuery = mysql_query($strSQL);
$resultData = array();
for ($i=0;$i<mysql_num_rows($objQuery);$i++) {
$result = mysql_fetch_array($objQuery);
array_push($resultData,$result);
}

$pdf->ImprovedTable($resultData);
$pdf->Output("report/keyboard.pdf","F");

?>