If you put the effort in to build a good application, there is absolutely no question that they can look past your past. At UMN, for example, the GPAs they calculate are "all pre-requisites" and "last 45 credits" ... so it's entirely possible your history won't even impact the academic portion of your evaluation. I went in to meet the (former) director of admissions there with similar concerns, and he literally laughed at me and said "We see people like that all the time."
Haha, good to hear that and I appreciate your response. My overall cumulative for everthing is a 2.71 (ugh). Lots of W's and a few D's and even F's. I was pretty stupid about it then. But most of the screw-ups don't apply toward what I'm doing now, and there are a few shaky general ed grades from back in the day, but for the most part they're ok. Could retake a few things and bring those grades up very easily. There were a few cases where it would have limited me on retakes. I took them before and thus only had 1 more shot at them to make it right. But that was general bio I and intro chem, both of which aren't the sort I should need extra attempts in - I have retaken both in the last year and did well, no need for a third go at 'em.
Pretty much all of the pre-reqs they'll be interested in were taken since fall 2009, and I was pulling a 4.0 on all that stuff until I got a 3.81 for last semester (grrrr...). Plus I have not even started into last 45 credit territory yet.
TomtheK9Fixer, I know what you mean... this getting up and down from the floor doing tech stuff is rougher on me than it would have been a few years ago!