On the why didn't Sam try another address...
Sam identified a seventh symbol as the point of origin rightly but didn't realise it was Earth because it was a different symbol to Earth. So she thought she was on a different planet. When she dialled Earth's address using the strange seventh symbol it was still Earth's address and as you can't get a wormhole dialling the address for the planet you're actually on nothing happened. She didn't realise that and thought there must be something still wrong with the DHD despite the fact that she had actually fixed it. She didn't have the benefit as Daniel did of watching the gate at the mountain also shake when she made her attempts.
Should she have tried a different address say to the Land of Light or somewhere else? Probably and it would have worked but Sam was likely in first stage hypothermia and suffering from sleep deprivation by that point; thinking clearly wasn't high on the list of things she was able to do.
Sam identified a seventh symbol as the point of origin rightly but didn't realise it was Earth because it was a different symbol to Earth. So she thought she was on a different planet. When she dialled Earth's address using the strange seventh symbol it was still Earth's address and as you can't get a wormhole dialling the address for the planet you're actually on nothing happened. She didn't realise that and thought there must be something still wrong with the DHD despite the fact that she had actually fixed it. She didn't have the benefit as Daniel did of watching the gate at the mountain also shake when she made her attempts.
Should she have tried a different address say to the Land of Light or somewhere else? Probably and it would have worked but Sam was likely in first stage hypothermia and suffering from sleep deprivation by that point; thinking clearly wasn't high on the list of things she was able to do.
Hope you feel better soon 
It was an honour serving with you 
You can sleep now 
You're a lucky man, Jack
Men!
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