Title says it all, I got knocked off the number 1 spot a month or so ago because i got lazy with my linkbuilding, i was down to number 8 or 9 at one point, so I started link building again and came across a pagerank 6 edu link. It hasn't been spammed at all, in fact its not even a blog. It has around 20 other outgoing links to non spam sites, these are official legit sites. Google has definetly indexed the page since because when i search for it and checked the 'cached' version my link is in there. So anyway this seems to have had 0 effect on my ranking since im still hovering around position 5 or 6 now. I was kind of under the impression that a pr6 edu link would hold a lot of power, any thoughts?