What am I doing wrong? C#

using UnityEngine;
using System.Collections;

public class MainGUI : MonoBehaviour {
	public GUITexture redKey;
	public GUITexture greenKey;
	public GUITexture pinkKey;
	public GUITexture yellowKey;
	public GUITexture purpleKey;
	public GUITexture orangeKey;
	public Vector2 redCoord;
	public Vector2 greenCoord;
	public Vector2 pinkCoord;
	public Vector2 yellowCoord;
	public Vector2 purpleCoord;
	public Vector2 orangeCoord;
	//other script with bool seing if you have a key
	public doors d; 
	// Use this for initialization
	void Start () {
		redKey.enabled = true;
		greenKey.enabled = false;
		pinkKey.enabled = false;
		yellowKey.enabled = false;
		purpleKey.enabled = false;
		orangeKey.enabled = false;
	// Update is called once per frame
	void Update () {
		if (d.aredKey == true){
			redKey.enabled = true;	
		if (d.agreenKey == true){
			greenKey.enabled = true;	
		if (d.apinkKey == true){
			pinkKey.enabled = true;	
		if (d.apinkKey == true){
			pinkKey.enabled = true;	
		if (d.ayellowKey == true){
			yellowKey.enabled = true;	
		if (d.apurpleKey == true){
			purpleKey.enabled = true;	
		if (d.aorangeKey == true){
			orangeKey.enabled = true;	

Im trying to get my GUITexture to display when I hit a key but nothing is happening

Have you noticed the mis-spelling on the tag in your OnTriggerEnter() function in comparison to your other script at all?