MS2000 Won't Power On, How To Troubleshoot?

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Have a Korg MS2000 that suddenly won't power on for some reason. I have the original AC adapter that came with the synth and I know its good as I've run it against a multimeter and it tested ok.

Using this video from youtube,

https://www.youtube.com/watch?v=--3iYqsVogM

I've cracked open the keyboard, however I have no idea where to start or troubleshoot. I really don't see any bad solder or bad capacitors upon inspection.

I have noticed that the AC jack on the keyboard seems 'wobbly', not sure how that happened as I store this keyboard in a flight case when not in use.

I also have the Korg MS2000 service manual and will start to look this over in hopes that it can help in the troubleshooting process. I don't see any type of fuse to test?

thanks