Help! Horse refusing to go forward! Wat should i do?

When you get back to the barn do you work him or untack and call it a day?  Try taking him out down the road and if he doesn't want to go farther take him back to the barn and when you get there, work him.  Don't be afraid of "I love my horse and don't want to hurt him" if he gives you fits undersaddle to the point you are concerned get off and make him hustle right there in front of the barn.  Have him trot fast tight circles, hindquarter disengagements, forequarter yeilds.  Make the barn difficult.  Then take him down the road again and don't ask for anything other than forward motion.  If again he wants to head back, repeat lesson.  It might take once or it might take days, every horse is different but if he ins't broke of this now, and he's new to you so testing, it will get much worse.
 
When you get just past the point where he wants to turn back, maybe only 10 ft.  If he feels like he is getting ready to tense up stop him and give him a good pat BEFORE he refuses forward then get off and loosen the cinch and walk him back.  If he is wanting to go farther then take him out for a little while longer and then do the same, get off before he tenses and loosen his cinch there.  Spend some time out there away from the barn, just the two of you relaxing.  Then walk back to the barn.
 
Has worked for me everytime but young horses catch on much quicker than an older horse.  I have had times where I didn't feel safe staying on due to the horse wanting to buck, rear, or bolt, so I got off and really make them work on the ground.  Then I'll get back on once I feel they are ready.
 
Hope that helps a bit.

I usually work him again when we get back to the arena, more out of frustration than anything, and then untack him. He's not a bad horse he really isnt he just has a few negative points that im willing to take out of him. He has never bucked or reared on me and i trust him that he wouldnt.
 
But i will try some of ur tips and keep u posted.

What kind of horse? (just curious)  I love the thought of hunting - tally ho!
 
Why not just sit there?  At a standstill.  He stopped.  Fine.  Stand your butt there till spider webs grow on you, stuborn horse.  (bring a book)  []  I think he might decide he wants to go ahead and walk some more.
This was the direction I went with Bully when I first got him.  Then I discovered carrying a crop and swatting his butt was a lot more effective.  Usually only had to give him one tap and his clutch re-engaged.

He's a big cob sort of horse bt not a real drowsy slow one...he's got a spring in his step! I have tried just standing there bt then he turns and turns and turns on the road. The whip doesnt really make much of a difference to him when he takes this notion.

update guys! iv had him out a few times now since i posted this post and iv tried to follow ur advice, sometimes it worked other times it didnt. i did make him go further than he usually does but then the messing started again. Ill keep working on it tho.
 
I have a theory that mayb he just doesnt like riding out on his own...

Your theory is a good one. I think a lot of horses are followers. They do not like to go out by themselves and do not like to lead.

My horse was a follower and over time she became the leader. I did this by taking her out a lot by ourselves. This were short little rides and she learned to trust me and in time she learned to really enjoy it. Now she has little patience if a another horse leads. Sometimes she will give up the lead but it won't be long before she takes the lead back.

She also behaves differently depending on whether there are other horses coming along or not. If there are, she wants to take a slower pace and if she constantly turns her head to check on the progress of those behind us. She will often want to stop and wait for them to catch up. If we are alone, she is much more interested in having a more spirited ride. Of course, she may want to go faster in order to get back to her buddies faster!