hello, but did you transfer and analyze the music with Engine?
No, because if you have not done this operation, I believe you will not see your music as soon as you turn on the P4.
Did you think to install the SSD, format it, pass the files to a folder and view them directly in the P4?
If so then, I recommend reading the instruction manual which does not hurt.
In case you have already done all this, then better explain the steps you have done, after formatting the SSD.