I just went through this issue in the last 2 days. Picked up a laptop from a co-worker, was at his place saw it working just fine. got home plugged it in and i got the same issues as the OP. after trying all the diagnostic stuff as directed, I gave up and went to bed. I get home from work yesterday and decide to try again before calling Shaw, Lo and behold it was working. WTF?? anyway, I know this is not much help but sometimes weird things happen with computers.
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