One more thing I will add, this is a bit of general computer advice... for those of us unlucky enough not to own the ability to make things work 100% according to plan first time...
try process of elimination.
Weigh up the information you already have and create a tick box in your mind (or on paper) If something doesn't work, as you eliminate each possibility the true answer to solve your problem comes that step nearer (sorry for stating the obvious but it really does work 100%)
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