My smartdisk doesnt turn on can I recover the data on the hard drive

You can to remove the hard drive from the housing and install it as a second drive in a desktop computer. If the drive is a 2.5" unit, you will need to get an adapter to convert it to the 3.5" form factor (the two sizes have different connectors, even if they have the same interface standard. If you have 40 or more pins on the drive, it's a PATA (IDE) type. If you have just a few pins, it's a SATA unit. The adapter should also provide a power connection for the drive.

This is a bit of a gamble - we're hoping the problem is in the power supply or interface and not the drive itself. I suggest before you start that you check for voltage at the output of the AC adapter (use a meter - some folks will try to make sparks and wreck the adapter in the process). If you get nothing, replace the adapter with one having the same voltage and the same or higher current rating. Verify that the +/- polarity markings match (usually center is positive).

You can try taking it apart and hooking the hard drive directly up to your machine via ide or sata rather than using the usb connection. Hopefully its the enclosure thats the problem and not the hard drive. This will likely void any warranty on the drive though