Sir DKasey563 . . . . .
You say . . .
1 . . .CD player makes a loud hum when powered up.
2 . . . opened it up and cleaned carefully
3 . . . but all I found was a disconnect wire at the front of the unit.
I say now. . .
1 & 2 . . . Would / could that sound be coming from the audio / speaker, possibly relating to minimal / marginal power supply filtering
OR
Could that relate to a the sound of a motor continually running . . .
BECAUSE of a broken / str e e e e e e e tched / liquified belt.. . of which . . . . two are being used in that unit.
Therefore no mechanical action for completion of its functional cycle, such that the motor will then turn off.
3 . . .Why should it be normal for that unit to have a loose "war" / or / disconnected plug ? Identify that area . . . .
More finite details now . . . . .please . . . .
73's de Edd . . . . .
I've had such a frightfull day so far, that I think I'll just put an "Out of Order "
sticker on my forehead and just call it a day.