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Sounds to me like a failed or failing capacitor (could be more than one) on the PCBs of the CD400. Had this a few times with various electronic items, such as TV's, home Hi-FI, etc. Take an age to power up, but work ok once warmed up.
Usually easily identified by the end cap of the capacitor being swollen/bulged. They should be flat.
If you can get the details off the side, and you're handy with a soldering iron, then they can be DIY replaced.
n.b. this is a general image for reference, it's not from a CD400
![[Image: Bulging-top.jpg?ssl=1]](https://i2.wp.com/allabouteng.com/wp-content/uploads/2018/08/Bulging-top.jpg?ssl=1)
Usually easily identified by the end cap of the capacitor being swollen/bulged. They should be flat.
If you can get the details off the side, and you're handy with a soldering iron, then they can be DIY replaced.
n.b. this is a general image for reference, it's not from a CD400