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I work with computers rather than musical instruments, but I imagine with all the things keyboards do these days they are almost certainly computerised, and your saying "tried to install os" confirms this.
In computers "SSD" stands for "Solid State Drive". If there is an SSD in the PA50, then it is quite clear to me that it is no longer working properly and needs to be replaced. Confirmed by the fact that you can't install the OS.
Hope this is helpful, if so would you please register that with Fixya
The missing nut is not likely to kill the channel. You just bought this so exercise your warranty... unless it is used in which case you bought someone else's problem. Somebody probably blew out the channel by zapping it with high voltage that destroyed the input circuit of the channel. Often there are bypass capcitors right at the input which short out. If this is boiught used, take to a repair shop and if new, exercise your warranty. I suspect they removed the nut from the connector to mark the dead channel.
The KSC10ML has NO volume control... only two 1/4 inch jacks. To get a matching "jack cup" you will probably have to go to Kustom. I have searched for the item on the web and only jack cups that seem to come up are for Marshall or ones that use binding posts. I found one blank one but it is 5 by 7 inches... too big for that Kustom cabinet. In a pinch if you don't need it to be recessed, cut metal or ABS plastic plates and drill for two jacks.
You will plug an UNBALANCED 1/4 inplug cable into the MONI jack on the front of the unit. The other end will probably need to be an XLR plug to connect to the Kustom POWERED monitor. Please note that the UNBALANCED output of the Phonic is NOT good engineering practice. The Phonic stuff is normally low-end and they don't do everything correctely, although for a small system it should work. IF you get excessive hum from using a long cable to the Kustom with a "Kludged" unbalanced to balanced cable, you MAY need to use a DI box at the Phonic end to convert the unbalanced Phonic MONI output to a balanced line (XLR to XLR) for a longer run to the Kustom monitor. You might get a 1/4 inch TS to XLR balanced plug that has a transformer in it and use an XLR to XLR cable to the Kustom. Please note that having this plug in the Phonic hangs out and is easily bent over so I would recommend using a right angle connector at the Phonic and plug the 1/4 inch TS to XLR adaoter into that so the yanking of the XLR cable won't break the 1/4 inch adapter off in the Phonic.
You didn't mention what brand powered mixer you have, HOWEVER MOST powered mixers also have a line level monitor and main output jacks. These are almost always 1/4 inch jacks. In any case you should be using BALANCED lines to the powered speakers using either XLR or TRS connectors on the ends. Please tell us what powered mixer you have so we can give you better answer regarding which connections to use. IF for some reason your mixer does NOT have line level outputs, you can use a high level Direct Box to condition the powered outputs to be sent to the powered speakers..
Also make sure ALL your interconnected equipment is powered by the same receptacle or source to avoid damaging due to ground bounce on utility lines and circuits. This often means running an extension cord from the stage where the powered speakers are along with a snake of the audio cables.