Well, frankly, no. If it's showing standby but not turning on then it's likely there's some problem with the power supply inside the TV. You could try unplugging the set for a while - say an hour or two - and try again, but it's a really long shot.
What surprises me is that you called Comet on Tuesday and it sounds like they aren't able to respond quicker. Almost a week with a faulty TV isn't acceptable in my book.
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