I doubt that durnurd would have asked the question if he hadn't already tried Internet Explorer

woah, my brain's slow this morning or something -- I had the hardest time figuring out whether I meant to say "had" or "hadn't" above

Took me about 3 minutes to figure it out... and I'm still not sure it's right!
Let's see... if he hadn't tried it, he wouldn't have posted the question because he would have had to try it first in order to be at a loss.
If he
had tried it and it worked, he wouldn't have posted the question because he'd already have an answer.
if he had tried it and it
hadn't worked, he would have posted the question, and I think this is the case, but it is not the case suggested by your message which is why I posted my comment.
Good grief... never has the inner workings of my brain had to be so exposed

. (the inner workings of my brain
hasn't ever
had to be so exposed?

)