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If replacing the keyboard (try a USB keyboard, instead of a PS/2 keyboard) does not help, and the old keyboard _does_ work when connected to some other computer, then a new motherboard is the next logical step.
I presume it is a PS/2 keyboard one that plugs into the Green Connector at rear of PC, if so, then these ports often fault, with the mouse being OK. The best way around this is to get a cheap USB keyboard, and install it. Ensure you set the USB ON in BIOS too. You could try uninstall/reinstall of KB from device manager first.
Okay, I've had the same problem with their keyboards and mice, first you uninstall and reinstall the driver, if that doesn't help go to start>run then open MSCONFIG. Then find the services and re-enable all of them, along with all the startup entries.
When you reloaded the OS did you reload all the drivers? Sometimes if you do not reinstall the Intel driver the USB port will not be recognized. Happened on the last two DELL's I reloaded. Go to DELL's website and download all the drivers for your model. Dell support website http://support.dell.com/support/downloads/
Look up your model by service tag, it is the alphanumeric code on the barcode label on the back of your DELL and also sometimes found on either the front or top of your DELL (sometimes it is hidden beneath the USB port cover that you flip up.
Try that and see if it fixes it. Also make sure that the connector did not come loose when you opened the case.
A little late for the original poster, but this answer may help someone else.
On the S90, press the "Utility" button then press the "F5" button under the display. Make sure MIDI IN/OUT is set to "USB" (using the DEC/NO and INC/YES buttons under the jog wheel). The factory default is "MIDI" which means no computer could detect it. Once you've done this, install the S90 USB driver on the PC then plug in the USB cable. The PC should detect the S90 and you should get a new item in your windows control panel where you can set MIDI I/O and channels.