Hi Joe,
The internal hard disk on a Tyros4 connects to the keyboard via a SATA to USB interface card which is fixed to the actual disk case with small bolts. You presumably are aware of this if you have changed the drive!
The interface board has a mini USB socket which connects to a cable from the main circuit board. The plugs on this cable have been known to come loose at one end or the other. I think that this is what EileenL is referring to, and is certainly worth checking.
The reason that I asked if the disk was working for other files was to see if it is working at all. If you open a file selection screen, the style screen for example, is the disk listed in the tabs at the top of the screen (as HD1)?
If it isn't, and you are sure that the hard disk cable is correctly connected at each end inside the keyboard, then there is probably a fault.
This could be with the hard disk, but if you have tried a new disk this is unlikely. (I assume that you transferred the interface card from the old disk to the new one!)
It could be with the SATA/USB interface card itself. This failed on my own T4, although I was able to ascertain that the the disk itself was working fine.
You can check the disk and the interface card by removing the disk in it's caddy, then connecting it to your computer using a suitable USB lead with the correct mini plug on one end. The disk should appear as a drive in Windows Explorer if you expand 'Computer'. If it doesn't then the fault is most likely to be with the interface card since the disk is new.
Yamaha UK would only sell me a new hard disk complete with the interface, and they wanted a stupid amount of money for it (£242 GBP! and that didn't include fitting which is a simple job that should take only a few minutes! Note that the same model of Seagate 250 GB hard disk cost around £40 brand new at that time, so they were trying to charge £200 for the interface card!!!
)
Knowing that my disk itself was fine and declining Yamaha's kind offer, I purchased an enclosure for a USB 2.0 external 2.5 inch SATA laptop hard drive which of course contains an interface. I deliberately looked for one with the same mini USB socket as the original interface card so that I could connect the cable without needing to use an adapter. This cost around £6 GBP from Amazon, and I plugged the original T4 hard disk into the interface from the enclosure and connected it to the T4. It has worked fine for a year now. In fact I have recently tried the disk in a USB 3.0 version of the same enclosure because the USB 2 ones are becoming harder to find and I wanted a spare interface, and this also works fine in the T4.
http://www.amazon.co.uk/gp/product/B00GSWT4HY?psc=1&redirect=true&ref_=oh_aui_detailpage_o04_s00I have also tried this with a SSD which also works fine in the T4, but obviously because it is connecting to the painfully slow Yamaha USB 2.0 bus, there is no significant speed advantage in the keyboard, but it is very much faster when I connect the drive to a USB 3 port on my computer to back up the Tyros disk.
So if you haven't already got one, you could get a similar enclosure to enable you to check if it is the original Yamaha interface card that is faulty. If it turns out to the problem is with the interface, you could simply use the one from the enclosure, unless you are happy to swell Yamaha's profits! I actually discarded the outer case of my enclosure and just used the interface from it, which allowed the disk to fit securely back in the caddy, which if you are transporting the keyboard regularly is probably a good idea.
Even if the problem is not with the disk or the interface card, you will only have spent a small sum, and you have an empty portable hard disk enclosure which you can use with a hard drive if you have one lying around (maybe the original from the T4).
Of course if this indicates that both the disk and the Yamaha interface are OK, it probably means that the problem is on the main Tyros4 circuit board, and you will probably have to have a new board fitted, since most service technicians these days won't (can't !
) troubleshoot circuit boards, they simply change them!
If you do think the problem is with the main board, it would be worth contacting Yamaha to see if they are prepared to help.
Regards
Ian