If maple wont start try this video at least it opened up for once.

[ZetaMoto]

https://www.youtube.com/watch?v=qQPbeBHkUZQ&t=82s
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If you can't find the SoScreenMode here
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For those people that have the problem in not having the soScreenMode in their Wizet file all you have too do is..
1. Go to Regedit>HKEY_LOCAL_MACHINE>SOFTWARE>WOW6432Node>Wizet>Maplestory.
2. Once you're at maplestory right click and click on new, then click DWORD(32 bit) value.
3. rename it soScreenMode and modify it from 0 to 3.