Im playing a mage and now that Im getting a med to high level I find I need some boosts in combat.
Ive heard the lord stone gives damage resistance bonuses, but I havent found it yet.

Can someone tell me where to find the stone please?

http://www.uesp.net/wiki/Skyrim:Standing_Stones

Yes Ive read that.
'East of Morthal' doesnt really help a lot.
How far east? Which mountain?

Ive been looking for an hour.

Oh, sorry. Erm... to be honest I can't help much, I'm at work so can't screen cap it. My brother found it yesterday, but he's on Xbox so again can't screen cap it.

Just Googled it and from various sources:

"You will find it in southwest of Dawnstar, in the mountain range, on the northern peak."
"Found southwest of Dawnstone[sic] , on the northern peak of the mountain range.
...and http://www.youtube.com/watch?feature=player_embedded&v=q5IqLOIewo4...

Thank you

I can't give you a better direction than others, but it's almost near Mehrunes Dagon shrine. It will be marked for you when you are doing the Mehrunes Razor quest.