[MC-71578] game will not load at all, mojang screen appears and then it says there is a problem.

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Incomplete without a crash report. Please attach it so the issue can be diagnosed.

First off you need to update Java to 7u67 or 8u20 and then it will work properly.

Mojang says Java6 r45 is the minimum if this is not correct anymore then this also needs to be updated.
https://help.mojang.com/customer/portal/articles/325948-minecraft-system-requirements